Responses

I think it was closer to minjae being bi sexual and the girl being a bitch Σ(  ̄□ ̄||) but I think he fell for him because he was showing minjae actual affection (even of it was teasingly)
and with woochan, he never really felt much attraction to the girl (because of the whole revenge thing with his dad) so it was like " this person is fun to tease, so let's see were this goes" kind of thing
the progression was a little too fast but it is tagged as a yoai so people want to see the steamy bits fast ٩(๑❛ᴗ❛๑)۶
Minjae: Girl, I love you so much, I'm definitely gonna get you back.
Woochan in Minjae's body: Hey.
Minjae: Woops I'm gay now lol
I still don't get it. What made him fall for Woochan? Did he fall for himself since he saw his body from another's perspective? Was he always actually gay and that's why he never kissed his ex? Was Woochan gay and Minjae was exactly his type so being in Woochan's body made him dokidoki for himself? Need explanations.