Chancing upon a newly tenured teacher's unspeakable secret, a contract teacher decides to use the knowledge to her professional advantage. Kwak Dong-yeon, Lee Won-keun, Yoo In-young, Kim Ha-neul, Lee Hee-jun, Jung Suk-won, Ha-neul Kim, In-yeong Yu, Won-geun Lee, Ki-woo Lee Added on Netflix 2023-01-10. Youtube Trailer