maybe. I dont remember if they ever mention the professor age but i assumed he was in his late 20s to early 30s, and im guessing Minjin is in his late teens. so they would have between a 10 to 15 year old age gap. thats why i didnt think box head was his father. but as i said i dont remember if they ever mention their ages. and he could have had him at like 15-17 but honeslty i dont think box head was getting any when he was in high school. he seemed very antisocial from the flashbacks, but ya never know.
I believe the professor is 27. ( I can be thinking of another character though), and I don’t think they’ve given Minjin’s actual age, but he’s a minor, so that makes him under 20. In order for his to be a 27 year old son’s, At the youngest Minjin would have to be 15 (15+12=27), but I doubt he’s 15 or his dad (whoever he may be) was 12 when he conceived him.
What if minjin is the box head dude's son (⊙…⊙ )