To anyone who has forgotten the plot or is confused by it, the texts below maybe can help ...

To anyone who has forgotten the plot or is confused by it, the texts below maybe can help you. (Note that this covers Chapters 1-52. Instead of a general summary, I made a summary for each chapter starting from 38. So starting from Chapter 38, it's gonna get lengthy.)

(Disclaimer: Everything written here may not be 100% accurate but I'm pretty sure it's at least has an accuracy of over 90%. If you want something to be corrected, please say so below.)
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This is basically the gist and what has happened so far:

- Demons can only enter our world through Doors which are humans.

- Joon becomes Cain's Door.

- Cain is a powerful demon who is at war with another powerful demon(?) named Satan.

- Cain can't defeat Satan because of the bullet in his heart which was shot either by Satan or Satan's subordinate. The bullet was from the fusion of weapons from heaven and hell.

- The bullet has significantly reduced Cain's power which is why he instructed his subordinate, the albino bitch Sid, to find the demon doctor that can fix this bullet injury.

- Cain gave Sid a special compass to help him find the demon doctor.

- Turns out that Sid is a traitorous bitch so now there are other demons messing and is after with the couple i.e. Cain and Joon.

- Sid became a traitorous bitch because he believes that Cain is not fit to be the lord of hell because he's too "soft". That and it's also possibly because of that weird demon parasite(?) or his multiple personality entity inside Sid that's is quite possibly influencing him too.

- JinYeong is Joon's bestie, who is secretly in love with him.

- Sid for some reason becomes infatuated with Jin Yeong so he tricks him into having sex with him, then he eventually kidnaps him and keeps forcing him to have sex with him.

- The Demon Doctor, named Aaron, has a clone that was killed by a demon (it's the demon that uses those bondage/rope thingies. Let's call him Bondage Demon.). The Bondage Demon was Sid's subordinate who Sid gave the compass to and instructed to find and kill the doctor.

- The Bondage Demon succeeded at locating and killing the doctor but he did not know that it was only a clone. The real Aaron thought that the attack was probably caused by Satan so he went to his friend/ally, the Pink-haired demon named Gael to find Cain to seek allegiance and protection from Satan.

- Aaron and Gael arrive at Joon's house to apparently help Cain and in doing so gain his alliance and protection.

- Both Aaron and Gael are afraid of Satan and they are hiding from him in our world, well Gael is, Aaron probably have other reasons.

- Aaron is actually the demon doctor that Cain has been looking for but Cain doesn't know that.

- Both Gael and Aaron used to be on Satan's side. The reason for their current state is still unknown.

- Sid suddenly arrives unexpectedly at Cain and Joon's home and Aaron recognizes him as the employer of the killer of his clone.

- Aaron is thinking of a way to prove to Cain that he is the doctor that he's been looking for since Cain is skeptical due to him meeting many fake doctors in the past and his trusted subordinate, Sid, reported to him that the real doctor was killed (it was only his clone that was killed.)

- Aaron concluded that if he proves that the compass is not with Sid, then Cain will know that Sid actually did betray him, that's why Aaron basically said to Sid "Where's the valuable compass that Cain specifically gave to you bitch?".

(At this point, it's gonna get a bit wordy. I'm gonna shorten it at another time)

- Sid didn't answer and he attacks Aaron, so basically he was found out. We get a flashback then telling us that Cain has always sent his minions to the human world to find the doctor, which is always assassinated for some reason. Then, one of Cain's trusted ally, the Little Demon Girl with Hugeass Hands, seems to know that Sid is doing something and when she was about to tell Cain, Sid was there and then Sid intimidated her and the little girl is obviously scared and thus remained silent.

- It turns out Cain has suspected Sid but now it was confirmed that Sid was betraying him and Cain is devastated because Cain didn't want to believe that Sid was betraying him. We get another flashback and we see a younger crying Sid being comforted by Cain. It seems Cain really cares for Sid and Sid too used to really care for Cain too. And so they battle. (Also, props to Joon for his quick thinking and lil Donut for his bravery, "I'm not afraid because I'm strong" lol, so cute haha.)

- Cain, perhaps shielding Joon who was attacking Sid, Sid got stabbed by Sid. Cain then asks why Sid is doing this. Like did he mistreat him (which of course Cain didn't.)

- So it turns out one of the reasons Sid is allying with Satan is that apparently, if Cain hands over his entire domain, Satan would "accept" Sid and that his efforts are appreciated and so he will be promoted or something. (Wtf bitch)

- Cain, who is still shielding Joon, gets really hurt, real bad. Then Sid leaves. Joon begs Aaron to help Cain. Aaron can't do anything because of how big the injury was. It also turns out that the magic around the area is being unconsciously sucked by Cain to heal his injuries. This was apparently a bad thing for demons with magic and so, Gael wanted Aaron and himself to run as far away as possible. Joon however stays and doesn't want to leave Cain and Aaron sees this and remembers a similar thing that has happened in the past (What this was is in the spoiler below)

- Because of this, Aaron decides to stay and help Joon to remove the fragments from Cain. (This is referring to that bullet that was shot to Cain's heart.)

- To do this, Aaron will use his power along with Joon's power (also, Joon is called Youngho now?, I'm gonna keep calling him Joon). This process is very very painful for Joon.

- During this process, it seems that Joon's consciousness entered Cain, and there he meets Cain. Joon then comforts Cain to make him feel better and so have they have this very wild, uberly spicy, belly bulging sex.

- The wild sex continues and the reason why Joon is not injured even though Cain is 2-3 times bigger is that all of these are happening in the mind. (But that doesn't mean they won't still feel the sensations.)

- Back to the real world, they are being attacked by Satan's minion. Gael managed to protect them because of his barriers but it is not enough. Aaron wants to continue because he wants to finish what he started and also because if he stops and leaves, both Cain and Joon will die and he doesn't want that. (Aaron at this point is really getting injured too.)

- It seems that Cain is powering up.




[Chapter Summary - Things are gonna get long here.]



38: Joon's celestial-like power and Cain's demon-like power "bumping" together is a no-no. While Aaron is holding up, it seems the healing process is putting a really huge strain on Joon's soul. Meanwhile, Joon in the mindscape notices Cain seems to be getting stable and is happy about it. However, Joon's soul in the mindscape appears to be disappearing/disintegrating (which could mean he was dying) but is saved by Cain. Cain did this by purposely stopping the treatment resulting to the fragments not being completely removed. Even so, Cain's power has substantially increased. Cain woke up and then asks Aaron for a favor.





39: Joon wakes up but Cain is gone. Cain apparently returned to Hell, never to return to the human world because he doesn't need to anymore and because he's completely healed. Joon is devastated of course because Cain promised he would stay with him, but Aaron is all like, 'what sweet promises did the Prince of Hell tell you, huh? ".

Meanwhile, Cain is somewhere around the city, saying stuff like he will stop anything that will extinguish Joon's light (life), even if it's himself. So basically Cain didn't really wanna leave Joon but he had to because he's endangering Joon's life T T.






40: Joon is devastated and in denial that Cain would leave him just like that.

It turns out Cain made Aaron lie. Cain also gave Aaron some of his powers that he found in hell. The surgery was not finished because Cain stopped it. The reason why Cain stopped it is because the surgery was hurting Joon. Basically, Cain doesn't want Joon to die because of him so that's why he left Joon in Aaron's care. He wanted to Aaron to lie that Cain doesn't need Joon anymore so that Joon would get emotionally hurt and wouldn't look for him.






41: Joon doesn't believe Cain just left him like that so he wants to know where he is. Before Cain left, Gail asks Cain to wake Joon up to which Cain refused because if Joon wakes up then Joon will not let Cain leave.

Meanwhile, a Blue-haired demon is attacking their building but they are protected by the barrier. The Blue-haired demon eventually breaks the barrier.

Cain is somewhere going super saiyan as he prepares to battle Sid again.

The Blue-haired demon enters the building only to find it is empty. Joon, Aaron, and Gail has already escaped via Donut's dragon form.






(Admittedly, the translation is a bit confusing in this chapter so take this with a grain of salt)

42: Cain is battling a lot of demon monsters.

Then we see Sid in a mindscape. Satan arrives and converses with him. Their conversation reveals that Sid's betrayal to Cain has a purpose, and it's not because Sid liked Satan or because he hates Cain. In fact, you can say that Sid is possibly doing this for Cain.

So we see Sid and Satan has made a deal. After Satan left, we can see that Sid doesn't actually like Satan.

Then the chapter ends with Cain stabbing Sid.






43: Cain is kicking Sid's ass. Cain asks Sid if he's the one who's causing all of these things. He is still shocked that Sid betrayed him. Sid monologues that he doesn't care what Cain thinks of him anymore, he has made his "decision".

We then see a flashback of a young Cain together with a young Sid. They seem like they had a really good relationship. (We also see Donut's origins. He was from a jade that young Sid gifted to young Cain. Cain instead transformed it into Donut and gave it to Sid.)

Sid managed to escape. We then see Jin (Joon's best friend) having some sort of a breakdown. Hating the thought that Cain is being with and stealing Joon from him. He also regrets things and wishes for it to return to normal, to be just happily be friends with Joon again. Sids arrives and Jin stabs him.






44: Jin tries to kill Sid but Sid restrained him. We then switch to Joon riding on Donut in dragon form. Joon wonders how Donut transformed into a dragon and Donut says it's because the master (Cain) has more strength thus his power increased as well.

Joon hears his phone ringing which was inside Donut's stomach. He sees a text from Jin telling him that he can come to his house. Joon's worried about his state.

They arrive at his house which is surrounded by several journalists and such which is probably because of the incident/massacre (refer to chapter 23 ) Using Gael's invisibility barrier magic, they enter Jin's house. They are greeted by an apparently "healthy/normal" Jin.






45: Jin invites them into his home. Joon is suspicious of Jin acting "normally" so he questions him. Jin doesn't remember anything, about the demon monster that attacked them or Sid. He only remembers he was on a house arrest of some sort.

For his own good, Joon avoids asking Jin any question that might remind him about doors and demons. He asks him how he contacted him and Jin says he saw his phone with no data on it except for a backup of his contacts. Out of all the number, only Joon was marked "Important" that's why Jin texted that number and also because he felt texting this number was the okay thing to do since they're close friends. Joon then flashbacks to Jin's confession and kiss and breakdown. Joon then says they will always be friends, always have and always will be. Jin is happy to hear this.

Jin then has a painful headache which he has been having since he woke up. Joon then guilt-trips Aaron into checking Jin. Jin stumbles and he and Aaron have an "awkward" moment with each other. (Thus a new ship has been revealed.)






46: Aaron is wondering why Jin is making him so flustered/nervous, which he hasn't felt for a long time. Aaron continues his check-up.

Joon is being sad af for Cain leaving him. Joon wonders if he was indeed just being used and fooled but he's so sure that everything was true so he won't believe it unless Cain tells him himself. He misses Cain.

Meanwhile Cain is still battling a loooooooot of demon monsters and he's massacring all of them. Sid is hiding somewhere healing his injury. We then see him having a conversation with this parasite-looking thing on his body saying stuff like he was to merciful (to Jin).






47: We see what Sid actually did to Jin after he restrained him on Chapter 44. He erased his memory about him and the demons and stuff. He then gives Jin a bj.

Back to the present, Sid senses the arrival of another demon. (A new character has appeared. I find him hawt too.)

Okay ngl, the translation was quite iffy but I think Joon and friends are trying to break the contract or the spell that's making Jin a Door. Aaron also notices Joon's very special soul.






48: Ben the Beastmaster is one of Cain's subordinates (I call him that because he has a whip for a weapon and he has an army of thousands of those demon dogs that he loves and cares for.) In Hell, he asks the Jazz Hands Demon Girl for the coordinates of his general Cain.

Back to Earth, Aaron made Joon realize about the transformation of the color of his eyes which shocks Joon. They speculate that his eyes changes on special or serious situations.

Aaron wants to know more about this change and he thinks that bringing Joon and Cain together would do that and so Aaron finally reveals to Joon what Cain actually did, which was he lied about leaving and not loving him.

Joon is both happy and mad about this, happy because it was indeed a lie that Cain didn't love him and mad because Cain said such a lie and left him, and so Joon drives the car Fast and Furious style so he could go to where Cain is (Lol, so cute. Go Joon, go get your demon bf)






49: It was revealed that Donut (the cute round demon) knows Cain's location and so Joon used Gamma's car to go to Cain using Donut. Gamma is one of Aaron's clones. Aaron has several clones of himself. (In this translation, Donut is called sticky rice. I'm gonna stick with Donut.)

Joon luckily found Cain, who was flying up high in the sky. Cain is terrified and tries to escape. Joon chases Cain fast and very furious style. Seeing that Cain won't stop moving away, Joon decides to drive off a cliff to force Cain to come back and catch him.

It works and Joon finally caught Cain.






50: Cain acts like he is mad at Joon for doing such a crazy thing but then Joon rebukes him and basically tells him it doesn't matter what you do or what happens, just stay by my side forever.

And then a very hawt, spicy, steamy reunion sex ensues.






51: Joon wakes up inside the car with Cain. Then they do more lovey-dovey stuff.

Joon asks Cain why he returned to his apartment even though he knew it was destroyed and Donut had already taken Joon far away safe. Cain reveals that he wanted to retrieve a photo of Joon because Cain wanted a photo of Joon while they are apart.

Cain also asks Joon who that human was in the photo with him because Joon was smiling there and he has never smiled like that when he was with Cain. Joon tells him that she was his fiancée. Cain is hurt by this.






52: Joon tells Cain that she died of some illness years ago and the reason he stayed in the apartment is because so he could feel her presence all the time because Joon didn't want to forget her. Also, those plants were her fiancée's favorites. Joon continues telling how hard and painful it was to live that way for many years.

Cain comforts Joon and tells him it's okay to stop telling him this. Joon tells him that he wants to continue and that he wants Cain to listen.

Joon was still in so much pain because he still couldn't move on until he met Cain and his life was then changed forever. Joon began "living" again.

Joon tells Cain he loves him and he asks Cain if he does too. Of course it's mutual and then they have a steamy sex again.

But their sex is interrupted by the arrival of an army of demon dogs and Ben, one of Cain's subordinate.




That is what has happened so far.




BONUS SPOILER (It’s about Jin and Aaron. Feel free to skip this one.)





Jinyeong, MC'S best friend, highly resembles the dead previous lover of Aaron the Demon Doctor. Jinyeong is highly likely the reincarnation of Aaron's former lover. Aaron's previous lover was also his door and maybe that's also the reason why he is stuck in our world. So Jinyeong x Aaron is endgame, they were always meant to be since 500 years ago.

Edit: The raw chapter 83 shows that Jin and Aaron is still very much happy together. They are still so adorable together.(づ￣ ³￣)づ