idk sexuality is complicated? the author seems smart so i dont know why she didnt just say kirin is bi. even if he's ONLY ever been attracted to one man (kang moo) thats....still technically being attracted to or in love with a man...like...author...pls. (maybe she just meant since he'd lived his whole life as a het guy and still sees himself as one in spite of all the butt fucking? idk)
and that's the problem tho, yeh internalized homophobia makes ppl in denial of their sexuality, but being attracted to one person regardless of their sexuality is also possible, ever heard of "love will prevail?" its that sorta thing. Kirin loves Kangmoo and Kangmoo alone, this is why the author says Kirin is still heterosexual.
HOW YOU GON GO TELL ME THAT MAN HETEROSEXUAL AFTER ALL THAT