Please remember that this is my opinion. You don't need to change anything if you don't want to.
I would like to start by saying good job on your book! I enjoyed watching (or reading) the relationship between the characters blossom and grow. I like Wonwoo and how you portrayed him. That he was scared from his parents, and the wheelchair, that he ends up needing someone to heal not just the visible ones, but also what his mind has gone through.
A note: Actually, there wasn't much wrong in the book, other than some spelling errors (which can be fixed easily). I would just specify who's perspective it's in. A few times, I had to read through until it gave me a hint to who it was, and then sometimes I had to re-read the chapter.
