Donghyuck held his breath as Mark started talking. "Jeno . . . has a nice body? He works out a lot." The rest of the boys started yelling and Donghyuck tried to even his breathing as Mark started talking again. So if Mark did like boys he'd like someone like Jeno. It wasn't hard to believe. Mark was fit himself, it made sense he'd want someone manly, like Jeno. (or, the one where donghyuck overhears mark say he'd date jeno because he has a nice body and donghyuck decides that he wants to be more manly. mark doesn't want donghyuck to change and misses his donghyuck.)