Black Dog (2019)

A young woman, Go Ha Neul, takes on a short-term teaching role at a private school, inspired by a teacher who once saved her life. As she navigates the pressures of the competitive school environment, she strives to support her students' dreams while growing alongside them. She is joined by Park Seong Sun, the career counseling head known for her fierce dedication to students, and colleagues Bae Myung Soo and Do Yeon U, who work together to tackle the challenges faced in the cut-throat private school setting. (Source: MyDramaList)