Please recommend me a manhwa or manga that will make me have a second lead syndrome

Haru Boku matsura.

Oops- haru Matsu bokura

cheese in the trap

Unripened Expression (if you’re ok with shounen-ai)

I second Cheese In The Trap! And if you like it, you should also go read I Love Yoo (ㆁωㆁ)

http://www.mangago.zone/read-manga/the_careful_empress/?l2gd
http://www.mangago.zone/read-manga/contract_concubine/
http://www.mangago.zone/read-manga/inso_s_law/

I really love inso's law

This manga really great I love it thank you for letting me know such a great manga

Glad u liked it~~