I see you read the raws. I couldn't understand their dialogue but it was a relief Heesu didn't actually kill him. And yet, I wonder: Why would he tell Saha: Everything you think is true? It looks like he killed him even though that's a lie and it seems he wants to make Saha believe he did it. I don't get why would he do that and not straight up tell him the truth
Yes that also made me so much confused at first. And since Saha was actually sleepwalking at that time I also started suspecting that he killed him. Heesu could have easily cleared all the misunderstanding but he chose to just play mind games instead.
No one. And it will be revealed in the last episode after Saha asked Heesu did he actually do something to the sick bro. Heesu tells him he didn't do anything and tells Saha to believe him. Then we see the flashbacks.
Yes the sick brother saw Saha and heesu having sex(ch21). And after he goes back to his room heesu comes to him. He asks him about how he tried to kill heesu when they were young. Heesu tells the sick bro that Saha is a man. The sick brother lies to heesu saying that he slept with Saha and knows that he's a man. Because of that heesu gets mad. And he starts to choke him and suddenly Saha comes in the room and the brother accidentally falls and while heesu tried to hold his hand, he slipped and fell. the sick brother just accepted his fate and died while thinking of Saha staring at him with cold eyes for the last time.
Honestly it was a little pitiful but this was the best ending I could ask for.