Slow building romance between teacher and student that's warm, realistic, and bittersweet. There's heartbreak and many feels in both series, which makes them loveable stories that quickly hook readers. There's also great friends who help each other out along the way. They are emotional, dramatic stories that move you in their realistic depictions and you can't help but love the funny characters.
I mean sure, you have the young and eager het student who falls in love with his mature, stoic and gay sensei. But the *real* reason you should read this recommendation is bc it too has a Levi doppelganger who looks gorgeous when he wears glasses.