So Confused.

here's a quick rundown the way i understand it:

dowhi is half ghost

dowhi and sungjae both liked each other but dowhi didn't know and in an attempt to get sungjae to like him, he asked ghosts to make sungjae like him by giving him erotic dreams

this caused problems as the ghost got attached to sungjae and didn't want to leave after sungjae and dowhi confirmed their feelings for each other

this causes him to bother sungjae and dowhi a lot, even possessing sungjae sometimes and doing some generally creepy shit

OK NOW MOVING ON TO THE SIDE STORY (i can't remember their names sry!! i'll refer to them as sungjae's cousin and other boy lmao)

sungjae's cousin liked that other boy (i forgot what their relationship was... i think the other boy was part of the family but kind of a bastard child bc he was the son of a prostitute??)

sungjae's cousin is a jerk and decides that if he cannot express his love for the other boy, he will make him remember him by bullying him.

this makes the other boy understandably fed up and leads him to curse the cousin's family with a book he found in a market place, making them cough up blood as you saw in the comic.

the cousin actually knows abt the other boy cursing him, but is ok with it and wants to die by his hands. i guess as proof that he's thinking abt him?? some sort of twisted apology?? i'm not sure

however, the other boy also starts to catch feelings for dowhi. this would normally be ok except he wasn't able to read the curse book he got in the market all the way through

the curse book said that in order for the curse to work, the curser (other boy) needs to ONLY have hate in his heart towards the cursee (the cousin) or the other boy will have the curse double back on him instead.

so instead of the cousin dying as he wanted, because other boy fell in love with dowhi, other boy dies.

NOW BACK TO THE MAIN STORY

the cousin is in anguish because the person he loved died (maybe you shouldn't have bullied him?) and thinks its dowhi's fault

he uses the same exact curse that other boy used against him to use against dowhi (that's why we saw him talking to the ghost (remember, this is the ghost that is obsessed with sungjae from the main story!!) and then that red mark appearing on his wrist).

this obviously causes dowhi to start coughing up blood, etc. the ghost also possesses sungjae and makes him attack him, beating him unconscious with a rock as we saw in the last couple of chapters

sungjae eventually snaps out of it but by then it's too late and dowhi is lying in the pond bleeding :(

then the ghost that is obsessed with him is walking towards sungjae and that's the last thing we see

OK THATS EVERYTHING THATS HAPPENED SO FAR I THINK
hope this was helpful lol

Yeah i agree with your description, i know beom and the little brother was incest, but their story was wrecking my heart for the tragic love story but i'm glad they are reincernate or something on their spin off and have their happy end ٩(๑❛ᴗ❛๑)۶

OH RLY YAY THAT MAKES ME FEEL SO MUCH BETTER

im kinda confused at the curse part. so if the curser (suyeon - sungjae's bastard cousin) have feelings for dohwi, why would it reflect the curse onto him, since his cursee is actually beom (aka rude ass bith)? is this some kind of plot hole or is it implying that suyeon actually have feelings for beom, bc if thats so... ohhh boiiii thats twisted!

so suyeon found the curse in a book in the market place but was unable to read the book fully and therefore know all of the conditions. basically, the curse would work as long as suyeon had ONLY hate in his heart towards beom but he started to develop strong feelings for dowhi (or that's the explanation given now at least, i have no idea whether or not suyeon started to like beom or not). so how it's been explained so far, the curse doesn't care who suyeon develops feelings for, only that it's a different feeling than pure hate towards beom and therefore a violation of the rules of the curse. he can ONLY have hate in his heart. since he didn't, the curse just reverses back on him.

this is part of the reason why beom blames dowhi for suyeon's death and curses him in return - he believes (wrongly!!!) that it's dowhi's fault for making suyeon love him and therefore killing him.

hope that was helpful??

Wow, what a complicated puzzle!
Thank you very much for the explanation. It helped a lot. :)

thankyou!!!(づ￣ ³￣)づ

I thought that generally the other guy really hates the cousin but eventually he developed love feelings for the cousin so that's why the curse go back to him