Are you saying he’s Zhenyasexual or something? I thought we’d all gotten to the point of understanding that people don’t just become gay (*bisexual) overnight, they DISCOVER that they are. If Eunsan realized he could have those kinds of feelings for a man, then he was always bisexual, he just had never questioned it before, so he’d only ever been with women. Now he’s with a man, which is completely consistent with being bisexual.
The same applies to Taekjoo with Zhenya, Lee Won with Caesar, and so on. Do you really think they all are “straight with one exception”?

eunsan literally riding cock and the author wants to say he’s straight instead of bi mhm right