Holy shit, this was super fucked up. Kangil saw Heewoo as a son figure/nephew and Heewoo was just a wacko with his twisted love. He raped Kangil so brutally. Inserting billiards and the stick inside Kangil's ass was crazyyyy! This is truly a fucked up read, but at the same time, the author delivered! The open ending suits this type of story. I do wonder if Heewoo killed his own father as a way to seek vengeance for Kangil.
Pocket Nᐤ7