This raised curiosity for the next broadcast. In particular, an epilogue scene where Hae-sung, whose real name is Jeong Si-hyeon, tells his father that he will be called Hae-sung raised the ...
In Undercover High School episode 5's epilogue, it was shown that Oh Su-ah had seen Jeong Jae-hyeon when she was a kid and was friends with Jeong Si-hyeon (now Jeong Hae-seong). She also saw an ...