
If I had to rank the guys, I like the brothers the most, but they're her brothers so that's outta the question. After that, I prefer Hyunwoo or Arachne. Johan is the most boring of the three candidates.
Although it started from personal curiosity, I think Arachne does genuinely like Bobae to some extent, given that he was accomplice to Haegi's crimes in the previous life. And I really like their interactions in this one, and the fact that he's quirky enough to not even mind living with her brothers.
For Hyunwoo, he's just the kindest and most sincere of the three.
He was nice to her without question even in the past life. But the teacher-zone LOL.

Just a reminder: this is a gag manga published in a Josei magazine/pix general, it's not technically a BL series (it's considered a parody or genre dissection).
Also, I don't think MC is aro/ace at all. He's literally said he likes big boobs, wants a girlfriend, and wants to give his parents grandkids. It's more like he's resigned to the world's power, not that he doesn't wanna date a cute girl.
Does anyone know the title of the manga in the credit page? (the one with the ribbons). I feel life I've read it but I can't remember the title.
Himitsu WA kiss de abakareru