Extracurricular Guest cast, played by Lee Jae Baek Episode 1x01: Episode 1 (Apr 29, 2020) Episode 1x02: Episode 2 (Apr 29, 2020) Episode 1x04: Episode 4 (Apr 29, 2020) Episode 1x05: Episode 5 (Apr 29, 2020) Episode 1x07: Episode 7 (Apr 29, 2020) Episode 1x09: Episode 9 (Apr 29, 2020)