Your theory is pretty fair (which is why I say I dont like hinting being so open, it could be a lot of very different things so makes hard to have a solid opinion on some things), although I disagree with MinJee not having cheated before. On topics like open relations and cheating she expresses some clear nervousness making it a pretty indirect nudge that those inquiries are also about herself. Your interpretation seems possible, but her way of tiptoeing around the topic of her sleeping with other men to the point she pretty much starts redherring seems pretty telling. Not saying she did or didn't do It to Daeshim, just that I find it doubtful that she hasn't done It herself before given how she acts whenever someone beings up the possibility of her sleeping with men besides her at the time boyfriend.
To me its the contrary, thats what makes her top tier, since it isnt lack of love, its just immaturity at play. Its easier to be critical of MinJee cus we are stuck with her the entire story, meanwhile the rest of the girls we just see them as fun fucks cus we dont interact with them much besides that, but all the girls are actually even less innocent if one pays attention to their characteristics:
- Hyuna has been or is at least willing to be in any range of the fidelity (or infidelity) Spectrum, she even finds stuff like that fun. She is a formar sex worked and involved in drug dealing.
- Beom showed 0 remorse at cheating on her husband even tho neither does the story nor her bio ever confirm or imply him dead, if anything her apprehension towards having sex with another man came from her insecurity about still being attractive, she even directly states she wants to get pregnant from the affairs - she has literally known you for like 10 minutes at that point lol.
- Dan-Bi similarly has 0 remorse, in fact she's like "fuck my boyfriend" (although TBF, fuck her boyfriend, dude sounds like a leech from the info we have on him)
- Duri is literally a serial killer, possibly has cheated as well given the details regarding her previous husbands murder, and she's a rapist that locks you up in her basement lol
Literally only girl who might be a better person than MinJee is Soomin, since she legitimately doesn't present any blazing red flags, but given its a NTRman girl if she actually had a longer route or multiple routes id wager that we would get shown that when she gets too drunk she'd let first big guy she comes across hit It or something lol. But that's just speculation given on how NTRman writes his girls, so we can say Soomin is the only puritan/trustworthy girl amongst the cast as far as we know.
IMO
In relationship reliability:
Soomin>>MinJee, Dan-Bi>Beom, Hyuna>>>>>Duri
In likeability:
MinJee>Hyuna>Dan-Bi>Soomin>>>Beom, Duri
