Someone in the top comments from the original chapter in Naver suggested to look back at that chapter where Mooyi is talking with the counselor. In there, we are told that his dreams were probably the trigger on why he lost his acting confidence at the time. Now thinking back, it was his lost memories crawling back from a bad place to put him in a very vulnerable position... and that they are memories from an abusive past where he got kidnapped... yikes.
I understand Mooyi's grandmother worrying for him to not relive those memories... but even so...
Also, totally NOT suspicious that someone went to that counselor's house/office to rob patients' records. YEAH, totally, completely NOT suspicious AT ALL.