People picking on him seem to forget how much he's gone through at the hands of a partner....just to trust again is monumental. He's never been properly loved and cared for, so having a person now (even with Sooha's own emotional issues) who is a good person loving him, well....he needs to see a counselor. And yes, don't be naive ever again. People out there who are users and abusers. Be smart, boy. Smart.
Yes. Now that you bring it up, I think virtually every major character here could use therapy.
Except Miss Doh. She needs to fall off a cliff.
On a secondary note, it's a little sad that Tae Soo is so unaccustomed to being cared for by his partner that he had to go fishing for a reason for Soo Ha to care for him.