The ending spoiler.
I wrote a lot.
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Towards the end, the father tells Minjae that he loves him. They end up having sex together. Taehyun wanted to warn Minjae that his father could kill him because Minjae killed his fathers real son. But the father denies that and doesn't want to kill him and Minjae believes him. One morning the father tells Minjae that they both should skip school. They don't go to school and the staff are wondering where they are. Taehyun hears about them not coming and rushes to Minjae's house in case something bad happened.
At home the father asked Minjae if he's happy and Minjae replies with yes. The father then picks up a knife. Minjae thinks his father might kill him because he killed his son. Minjae tells him, "It doesn't matter what happens to me, as long as you feel better." The father then stabs himself in the stomach.
As he's on the verge of death he tells Minjae, "Killing myself would cause you the most despair. Minjae, you said you loved me, right? You said I was the most important..." Minjae wants to call an ambulance but his father stops him. Then his father continues, "Don't go. You said you'd do anything for me. Watch me closely... Now you'll know the pain of losing what you hold most dear."
As his father in about to die, there's a banging on the door. His father then grabs Minjae's hand and says, "Listen to me... I... Agh...I... never once loved you. Now, it's your turn to live in despair... so don't die. Live."
Then the door gets slammed open and Taehyun with the police. As the father is lying down dead, Minjae made it seem as if he killed his father. Taehyun stops him and drops the knife from his hands. Minjae tells the police officers that he killed his father. But Minjae says this so that his father's revenge for him ends perfectly because that's all he can do for his father.
Here's the link https://www.lezhin.com/ko/comic/perfect
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I'm glad I have the chance to buy and read it on Lezhin. Though I do have to say there are only 37 chapters. I honestly thought there would be more. Because of this, I really think everyone is gonna hate the ending because it ended abruptly but shocking.