He was able to as seen by how drastically improve yoon condition during the time they love together but there are external issue with that debt collector that ruined it. He put yoon in paranoid state where he think gyeul didnt sincerely like him. If only that situation didnt happen and they were given more time i believe yoon would have a better stability in his mental health
No because he gonna tell yuwol but he need time. Yuwol gonna be shock for sure but it not gonna be that bad if the tattoo guy didnt butt in. The issue is
1. Yuwol mental state is still at chaos during the time the tattoo guy reveal the " secret "
2. The tattoo guy manipulate the fuck out of yuwol mind by saying everything he been receiving is fake
3. It should have come from gyeul himself thus he could explain it better from his side
I almost want the main character to stay with the old lady and the little boy. I feel like mentally, he needs that kind of stability and peace in his life.