After the pain and not even anyone on his side after all the years, would you easily let someone in just like that?? No right its same as this guy. He aldy left to broke several times by ppl who he put trust into, his family, his ex lovers but they shattered his trust easily. And he knows the one that will be hurts the most is him. Like that sayings, who loves the most always in much greater lost. But im glad the other guys treat him childishly to make him more comfortable to talk his feelings out. This approach is very sensible cause when he aldy depressed you cannot pressure him into not thinking whta he aldy thinks. Its useless like he said he couldn't help to thinking abt it. It's something that he can't control. So instead divert his attention to reassure him. For the hundreds time i love this manhwa so much ❤️