Seo Kang Jun stars as Jeong Hae Seong, an ace NIS field agent who disguises himself as a student at Byungmun High School as part of a secret mission. Previously, Hae Seong broke down in tears ...

Seo Kang Jun is at risk ... got into a physical fight with Park Tae Soo (Jang Sung Bum) while attempting to stop him from bullying Lee Dong Min (Shin Jun Hang). In newly released stills from ...

The identity of the assailant who secretly entered Seo Kang-jun's house and stabbed Jin Ki-joo has been revealed ... their happy newlywed life. Kang Tae-oh proposes to Lee Sun-bin amid Lee ...

Undercover High School' Jin ... Seo Byeong-moon (played by Kim Ui-sung). The next day, Jung Hae-sung was misunderstood as a perpetrator bullying Lee Dong-min (played by Shin Jun-hyang) by Park Tae ...