Comment by TeamLeewon on Nice to See You - Chapter 21

The parents really did both boys dirty. Sibling rivalry is pretty normal for children and it's important for parents to be equally supportive and attentive to give stability. Adding in one child who is ill and naturally requires more care causes deeper insecurities. It's difficult but even more important to create balance and encourage empathy and care between the brothers. The parents failed spectacularly. Jiseong is jealous of Jaeyi because Jae has freedom and mobility. Jiseong naturally hordes the one thing available to him - his parents. His whole world is a hospital and his only company is his family. That's isolating and depressing for a child. Jiseong doesn't realize that Jaeyi is equally isolated and lonely and that this freedom comes at a steep price. Jaeyi is taught by his own parents that he's insignificant and not worthy of time, attention,  and support.  Because he's not sick. The parents have fostered competition and  jealousy between the brothers. Jaeyi simply ops out and doesn't get attached to anyone or anything.  Jiseong feels entitled to sympathy and care and uses accomplishments to prove he's greater than the illness that ruined his childhood. Each brother carries a weight and has unhealthy coping mechanisms that put them at odds. All fostered by clueless inept parenting. I hope the story allows all the characters to grow and learn including Jiseong. I don't think he's a villain but his actions are cruel to Jaeyi who had no more choice or control than he did. I'm rooting for the brothers to figure it out and hopefully Ideum doesn't get hurt in the process. He has his own journey too. No less important. I'm not certain if Jaeyi is going to be able to give up Ideum so easily. It may be his instinct but he's formed an attachment with Ideum that isn't easy to dismiss. That's going to make for a complicated internal struggle. I still suspect Jiseong is going to find out he genuinely likes Ideum whether that's romantic or platonic I don't know. But Ideum maybe the first person who actually understands both brothers and can offer genuine love.