You're Felix. You have scoliosis and one of your legs in shorter so your parents wanted to help you and they went to the doctor and he said that it's good for you to go to a rehabilitation for your posture defects.

You arrived there today it's your first day. You went to the nurses desk and your parents had to write out some statements, the doctor examined you. You will stay here for 4 weeks. You will have treatments in the morning and after lunch school. On the first day there's no treatments just school. You arrived in your new room and saw 3 boys, that will be now your roommates, including Hyunjin who you don't know but thought he looks nice...