I mean, I agree. Shin is not only the more realistic but objectively better choice. But I have never seen that pattern break. The ML has to go with the most politically powerful option, no matter how irrational it is or how many loops the author has to jump through to make it happen.
I hope this story is an exception. It probably won't be.
Ikrrr like he is the only genuine one who doesn't want her to be hurt. The other was like "i don't regret my choice from back then" like bro that made her miserable after she sealed her feeling and only made her live like shit and HE SAW ALL OF THAT not like he didn’t see and he still didn't help her and now you dare come back searching for her like get the hella out of here

PLEASE SHIN, take my girl away from the other guys
im hoping their endgame. seeing as they’re both starting to develop feelings for each other, it looks like thats where
it’s headed but idk. author might throw a curveball and end up making it a reverse harem thing