
Because that's his character archetype... It's fiction. And fiction isn't real life. Real people don't fit into neat little categories that we can label. Real life is too messy for that. That's why fiction has rules which we call tropes, cliches, archetypes, try-fail cycles. . . We make our popular fiction neat and make the people fit into their boxes. And we like it that way. It makes us feel like even if we can't fit our own lives into neat little packages with satisfying conclusions and all the loose ends tied up like a bow, we can have that in our fiction.
Even in regular old everyday fiction. Want to see an example of exactly what I'm talking about? Go watch The Breakfast Club. It's entire plot is about establishing stereotypes and then shattering them... But they don't really... Because in the end all of those kids fell into one larger stereotype... The rebellious teen...
Popular fiction plays inside the archetypes, literature tries to break them. And yaoi isn't literature.

I get what you’re saying and I can’t articulate myself that my well. But...... art imitates life. Same as we create those tropes they can be written out. We don’t fall into squares and why should our stories. So because SY ‘acts’ a certain way he can’t be with Jisuh or he needs a ___ type of guy. Like I said same old same old. And because of mindsets like yours stories like this will continue to be made. Stories become very boring very quickly when you can just guess the outcome.
Out of control a BL webtoon challenged the fact that both mc’s need to be attractive. Momentum is another BL webtoon that I recommend. I really liked FPOT because I thought this would end in a poly relationship something out of the norm but here we are...
Thoughts like yours seem to be the majority so I guess I’ll see myself out.
Jisuh isn't interested in SunYool. SunYool's purpose in the story is to create conflict between the MCs. He's likable, but c'mon... He's a princess. He wouldn't be happy with Jisuh in the long run. SunYool needs a stable, older seme who finds his antics amusing. He would just wear Jisuh out.