They’re highschoolers.
iirc from reading the raws, there's no smut in the manhwa. even if they're in high school there are manhwas that do side stories where they're adults and have the smut, but not this one.
this story doesn't have smut in it, since it's based off the novel and the novel didn't have any smut scenes in it.
with that said, the 2nd volume of the novel did have smut, so hopefully that gets a manhwa
wait I might actually be thinking of a different novel, so yeah I don't think the manhwa got any of the smut scenes from this novel
.I hope the smuts don't get censored