But I think that ml here is feeling a sense pf guilt for not being able to be there for the OG I-heon. I don't know if he realize it himself but there's a clear indication that he does and he is feeling it. And so, he turns those feelings into suspicions and vents this to the now MC I-heon. He clearly hates himself for it but doesn't know how to express these emotions since he grows to this age behind a mask, a pretender who must not express thoughts that's detrimental to him. He is used to it and has forgotten this feelings but due to the MC I-heon and the OG I-heon, this feelings resurface and turned into a thing called "curiosity".
This is just my thoughts, okay.
But I think that ml here is feeling a sense pf guilt for not being able to be there for the OG I-heon. I don't know if he realize it himself but there's a clear indication that he does and he is feeling it. And so, he turns those feelings into suspicions and vents this to the now MC I-heon. He clearly hates himself for it but doesn't know how to express these emotions since he grows to this age behind a mask, a pretender who must not express thoughts that's detrimental to him. He is used to it and has forgotten this feelings but due to the MC I-heon and the OG I-heon, this feelings resurface and turned into a thing called "curiosity".