Dramas like Undercover Highschool Agent/ Good Boy/ Weak class hero

Hi everyone! I’m looking for K-drama recommendations with the following themes:

High school setting

Detective / investigation

Secret agents or double identity

Strong bromance & teamwork

Gangsters / crime elements

OP (overpowered) male lead

Romance is fine but not the main focus I enjoy fast-paced plots, smart or badass male leads, and group dynamics rather than heavy romance.Plus big series and episodes preferably,not compulsorily. I have already watched: Undercover High School High School Return of a Gangster Weak Hero Class 1 Good Boy Sweet Home If you know dramas with similar vibes—especially high school + undercover/action or crime with strong bromance—please recommend!I have just got into kdramas and I loved it .Please,do help.