Black Dog - Season 1 Episode 6 : Ms. Ko, the Whistle-Blower 2020

After failing to get exclusive information about HanKuk University admissions using a connection, an issue arises about the advanced class. Ha Nuel finds out that there are advantages to specific students who got to learn the curriculum in advance. Knowing that the flaws exist both in the school system and teachers, Ha Nuel decides to tell everyone about them for students. Meanwhile, Ha Neul comes across what other teachers are doing with their after-school classes.