In their character profiles you can find their ages, the teacher is 36 and the student 18 (so there's an age gap of 18 years, but he isn't a minor anymore soo it's not illegal.... Well if they weren't teacher and student at least 😅) (I'm confused about the sleeping together part as well, but I think the translation is a bit wrong or sth bcz I don't think that happened since the dad is straight)
I figured their relationship teetered more on taboo (Teacher & Student) than it did illegal(Adult & Child). Like, I didn't think the MC was that unwell. Like yea, the age gap is a bit 👀, but like grey area and all, technically its "ok". Either or thank you!!!
(I also think the translation mucked up the situation too but guess we'll see if there are flashbacks or not. I'm also curious if the dads completely straight or if he was into the MC and just married to 'do the thing' like they have in some tropes)