well, he's scared of being thrown away. It looks like he has a feeling of safety (that he will not throw him away) when he's with the blond guy?? I mean, he is also scared of being left alone by him but they know each other for a longer time as it seems and apart from the blond guy, yeonsu doesn't seem to have anyone, he doesn't wanna be alone. The actor is nice to him but who knows how long he's gonna stick around . He probably thinks that their time is limited (which it actually is) and that's probably the reason why he's still with the blond guy?? Idk
mabey, we will see more of their past in the next chapters
we need a fb of how those to met each other
but i still don't get it why is he so obedient to that blonde guy? can someone explain to me please cuz maybe i missed a few things accidentally or something