C2160 Teenage Warm Yang 10
Because he knew that depression could be cured at least by professional treatment, but not completely.
Actually, the best method would be to have someone to accompany Su Yun.
In that case, there would definitely be a way to recover, not to mention that Su Yun wasn't someone who needed other people in particular.
However, he knew that Su Yun really needed someone around him right now