[All] How will National Intelligence Service agent Jeong Hae-seong (played by Seo Kang-joon) solve the case by disguising himself as a student through undercover investigation?

"Jung Hae-seong (played by Seo Kang-joon) in Undercover High School

The gold incident that seems to be connected to a ghost story at school

It seems like the content is unfolding

I think the role suits you very well

I think it's going to be fun to watch in the future