Comment by I love sweets on Quintenzirkel

@I love sweets Well, as far as it is known ML's father kept him under strict surveillance since he was 6 years old (since his father assumed ML killed that girl), his entire life was just showing his mask and then suddenly a guy who was in love with him and ran away on a rainy night a few days before that didn't even recognize him when he was asking him about books.
Of course it would pique his interest. So far that he wanted to know what's going on - and getting into a brawl with him where he got told that Iheon jumped off a bridge. Then everything changed, but only because Deukpal didn't treat him like everyone else.

And as far as I can see he lets Deukpal make any decision he wants to make - he still wants to know what is going on. And he will soon. Him being fussy is for us readers to get story. And at least in this one it's not like "Oh sure, your soul swapped, I believe you"... Deukpal even told Sekyung after the brawl in ch 18 that the real Iheon will be coming back soon.