Hello~ I'm looking for a manga where the girl is a highschool teacher but she's actually just the same age as her students and only the principal knows about it, until one of her students found out(the male mc)

I can't remember the genre? but the art stly is somewhat new.

Sorry for the trouble and thank you so much!?

Full House Kiss?

Ah, that's not it, the girl is a teacher already, she graduated from university at a young age because she's really smart?

A search leads me to Seishun Shiteru Kai!

in need of romance?
uncommon, sad, sweet

Thank you so much for your effort?but it's a newer manga with a more modern art style?