Most prominent example would be Hirunaka No Ryuusei, but I'm curious about others.

Romance should play a big role and anything goes beside BL/GL.

Thank you!!

I'm not sure if I wanna do this

Vampire knight
Bitou lollipop
100-Day Dating Plan
Cat Street
Cherry Boy, That Girl
Corset ni Tsubasa
Daga ga Tame ni Hagane wa Naru
Hajimari no Natsu
Hanasakeru Seishounen I watched the anime It was entertaining
Happy if You Died
I Got a Boy
My Secret Brother

These may apply:
Moe Kare!!
Uwasa no Midori-kun!!
Tonari no Atashi
Boku kara Kimi ga Kienai kinda
Sonnan ja nee yo this one in particular, I couldn't really tell who's the first and second male lead
Tian Jiang Xian Shu Nan similar to above (at first, but then becomes a bit obvious)

I'm in idol hell T.T

kitchen princess