Min Bok-gi

as [Dean of students] (10 episodes)

as Judge

as Han Tae Kyung [Editor in Chief-Gisung News] (16 episodes)

as Kim Bok-gi

as [Chief Detective] (3 episodes)

as Steven Kwang

as Mr. Kim

as [Mi Ran's older brother] (6 episodes)

as Min Duk-soo (128 episodes)

as CEO Bae

as Kim Sang-hyeob (2 episodes)

Director

as Ex-prosecutor

as GG CEO

as Chief Tak

as Family doctor

as [Employee of Park Jae Gil's father's company] (2 episodes)

as Professor Choi

as Department Head Lee (1 episode)

as Park Dal Moon (20 episodes)

as Mr. Min

as Department Head Lee (1 episode)

as Soon-jeong's Father

as Judge for contest

as [President of Nirvana]