Felix

Felix is ​​a 17-year-old boy with a yellow mullet who had skin cancer, forcing him to wear a yellow fine-knit sweater even in the summer. He recently met Hyunjin, who had a heart defect. He brought him to a treehouse where other children with poor health were staying.
Hyunjin led him into the house and introduced him to the guys. They were Bang Chan (Kris), Changbin, Ryujin, Minho, Han, Seungmin, Jongin, and Jungkook. Felix asked Hyunjin:
— Is there anyone else here? I mean, does anyone come here?