Comment by Quintenzirkel on I love sweets

@I love sweets First of all, please use Enter more often 😅 
Second you said again that ML's behavior around MC is annoying and stupid - but for ML MC still is another person, not MC. ML still doesn't know that Iheon is dead, he doesn't even know that it is the same body. That's why he collected the hair from MC, his mum and the dad (on the day of the funeral if you remember).
ML's thought process to this point is that he wants Iheon to return (again, not the soul, he wants Iheon in person to return since he doesn't know anything more than what Deukpal told him), but he wouldn't mind if the fake Iheon - Deukpal - stays. 

Iheon's soul will watch the trial of the bully and how he and his gang get sentenced and then forgives the bully what he did to him. But that's for later to happen.

I think I don't get your main point, you're saying ML has no business with MC since he only watched him getting bullied? 
If yes, then no. Everyone watches at some point someone getting bullied and doesn't do anything about it. Just because Iheon was treated badly by his family and broke after all the bullying you want ML to take responsibility for Iheon's suicide. Yeah, no, that's not how the world works or even should work. There are real perpetrators in Iheon's case and ML is not one of them.