
That is something I wrote last week. BIG SPOILERS
SPOILER (edit. MAJOR SPOILER)
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The event "Artisan Exhibition" gonna gather many top hunters. The organization of the hunters at the event is gonna be funny. The author calls them 'hamsters' and later in the story that is still used to describe them. The event is about selling Hong Ye-seong items as he is the only one S craftsman. We gonna see the 4th S ranked hunter I think his name was Gyu-Gyu. He and Lee Sa-Young have beef. Gonna fight. Jung Bin gonna restrain Lee Sa-Young but his restraining power is about reversal of one's life before it awakened. Well, spoiler.. Lee Sa-Young was almost dead before awakening and as Jung Bin had a talk with Gyu-Gyu, forgets to unchain him (that his power) and Lee Sa-Young became ill but just in time Jung Bin release him. In the mean time Lee Sa-Young is at the event (as his condition is getting worse) betting for the exhibition top item "A spear". Lee Sa-Young gonna get it. Well here is one of the funny parts. When top hunters are gathered, every one would want the spear. A fight occured among the hamsters and it was hilarious. We gonna have some cute scenes between Cha Eui Jae and Lee Sa-Young. Lee Sa-Young gonna really doubt that Cha Eui-jae is J. And the next main part of the story here is that one eroder dungeon appeared. The four of them Cha Eui-jae, Hong Ye-seong, Kkokko ( ) and Yoon Ga-eul (don't ask is too long) get illegally into the eroded dungeon. Cha Eui-jae wants to investigate it because may have be connected with the West Sea rift... To mention that at the same time Lee Sa-Young and Jing Bin are in that dungeon to clear it. The magic four know that but are hoping not to meet the other two. Needless to say it doesn't go that way. Long story short... As he has no choice Cha Eui-jae reveals himself as J. (Jung Bin was unconscious so he didn't get to know who J is, only that J is back). He defeat the golem (the boss of the dungeon) with the spear from the exhibition. It is revealed by Lee Sa-Young that he bought it so he can give it one day to J. Idk if I mentioned it and no way I am reading all that but the spear is S+ rank. Also the dungeon was S rank. When Cha Eui-jae entered is changed to S+. That was strange for Lee Sa-Young end even before knowing for sure about Cha Eui-jae it really makes him suspecting him even more. Also Yoon Ga-eul will find fragments in real life here (from the dead golem). That was strange because they appeared only in her dreams till now.
Oh man.... That is the main story of the next coming chapters. Soon after that we are gonna get Lee Sa-Young past and that he is the boy Cha Eui-jae saved "his only succession". And yea... I remember it from here it gets hard and harder for our main characters. And some kissing scenes to, hugs and other sweet moment between them.
That was hella long, sorry. I binge read those chapters and I may left out some parts as I don't remember everything but yea. For now that's it. I will add more If I remember. (๑•ㅂ•)و✧
SPOILER number 2
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The fight that occurred between Gyu-Gyu and Lee Sa-Young was because Cha Eui-jae went missing. The reason was Hong Ye-seong. He kidnapped him because he sensed item that was made by him in Cha Eui-jae's inventory. Turns out to be the Basilik's fang sword but the thing is.. He didn't made it, exactly. Not in that world. It was Hong Ye-seong from the second words but sence everything made by Hong Ye-seong has his trace, he sensed it in this world too. Cha Eui-jae didn't reveal anything to him since that was connected to J and West Sea rift and at this point is was still his secret. Hong Ye-seong didn't want to leave thing so Cha Eui-jae mentioned the yellow gemstone. Yes, the one Ye-seong wanted to badly. So they made a contract to not ask anything realted to the Basilik's fang or his personal anything and exchange he's gonna get the gemstone. Contract was made but as events flow he couldn't get the stone at the exhibition so... That was also one of the reasons later on they went together in that dungeon. One more favor before he gets it for real.
Also at this Artisan Exhibition Cha Eui-jae went under cover by the identity "secretary Kim" as he is merely D rank hunter and have no place there. Lee Sa-Young basically forced him to go with him on a date at that exhibition because Eui-jae really didn't want to go. So no one knows he is Cha Eui-jae except Lee Sa-Young. Hong Ye-seong too but very soon finds out (just before the dungeon part) A will summary here much... BUT... before all this. Just after the bed/sofa thing... As a thanks or whatever Lee Sa-Young helped Cha Eui-jae grandma with her sicknesses as he took them to Nam Woo-jin (the medical hunter). Long story short, after a short personality test on Cha Eui-jae, Nam Woo-jin explains the Artisan Exhibition and gave him tickets. Later Eui-jae banged his haed as didn't want to go but the tickets were indestructible and he hid them from Lee Sa-Young as the reason he got them was a test but the test was based of revealing Lee Sa-Young' past and Eui-jae's reaction. From the spoiler above I told you in other moment that we well get Lee Sa-Young past but that was from Eui-jae perspective, here is from Nam Woo-jin's. I am telling you that because these tickets will cause big a scene. But I have to go now and really at this point just read the novel lol.. So much is there to be told and I just can't shorten it... T-T

*stretches fingers* So... To your question
Spoiler
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Before the most of the events and before the West Sea rift there was a dungeon or rift (i don't remember exactly). From that (I will call it dungeon) dungeon there was a kid, a civilian, almost dead poisoned with his skin melting etc. (the dungeon's boss and monsters were "poison" type). J was the hero back then who tried to save everyone. But in that dungeon he only found the barely breathing poisoned kid. Everyone else were dead. So J took that kid to the hospital at which the kid went trough a detoxification. That detoxification went for months and months. These were the times when they became close. Even tho Sa-young was all bandaged up and couldn't see or speak. J spent days with him. That's why neither of them know how the other looked before. One was with a mask and other blind and bandaged up. J was also the one giving the hospital the needed resources for the detoxification. West Sea rift came and J disappeared. After 2 months the supplies for Sa-young's treatment were over. They wondered what to do as the treatment was super expensive and no one could afford it. As they almost decided to leave him to slowly die at the hospital a woman came and took him. And that's when the torture begin. I don't remember for how long (years for sure) but Lee Sa-young was experimental subject. They said that he was holding in the most pain of every other subject. (The reason was that Sa-young was waiting for J and even tho years had passed since his disappearing, he was always waiting. That was and the reason J survived years in the Weas Sea rift, because he made a promise to come back to Sa-young and he couldn't brake the promise. That promise was made before J entered the rift. He told Sa-young that he had job and it will possibly take time hence the promise to be back) So as Sa-young waited and being tortured at the same time. I think one day when the experiments continued and as he was on the verge of dying... He was held at some base in the mountains. As he was experimented on he was dying and at that moment just before death, he awakened. He destroyed everything and kill everyone around him and that awakening saved his life. Also Jung Bin and Bae Woo-Woo were the first to find him at the scene. So they know almost everything about Lee Sa-young. So Jung Bin's power brings him to that state. A poisoned tortured civilian kid at the verge of dying.
I could tell you more about the experiments and what were they about but that would mean different kind of spoilers.
Also this is the past of the Lee Sa-young of this current world. The second one is different and the first one is not told as I can remember.
And his past isn't revealed all in once. This whole story is a summary of many told fragments through the novel.
I am really tired so idk, if I am missing anything I would add it later... (๑•ㅂ•)و✧

Hahaha (╯°Д °)╯╧╧ I will try to summarize it.
Spoiler alert
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Prometheus is a secret organization (basically cult) that claims to awaken those not chosen by the system to stop the apocalypse. They hate the system awakened ones. In the early days, Prometheus would kidnap people with connections to rifts, such as survivors, and experiment on them. There have been no known survivors. But WE know of one "Lee Sa-young". They just don't know it lol. He was a subject to those experiments. He was also the only successful one. This whole organization was created because some "seer" was telling that he could see the destroyed world and also he could see the end of the current one just as Yoon Ga-Eul. Also they give the "opportunity" to lvl up your grade. Something that is normally impossible because the grade given by the system is absolute. There is only one known success of that but I don't remember if in the previous chapters this hunter is shown yet (I think he is). It was someone from the old generation as J. The guild leader of Samra guild. "The tiger" or "the old tiger" is his hunter name. Don't remember the real one. But that information about him is revealed very very late in the story.
i need spoilers plis plis plis by sabrina karpintero