Seo Hyun-jin is a South Korean actress and singer. She is best known for her roles in the TV Dramas Black Dog (2019), The Beauty Inside (2018), The Beauty Inside (2017), The Beauty Inside (2016 - 2017), Another Miss Oh (2016), The Three Musketeers (2014), The King's Daughter, Soo Baek-hyang (2013 - 2014), Feast of the Gods (2012) and The Duo (2011).
Go Ha-neul becomes a teacher in a private school due to to her gratitude to a teacher who saved her life when she is young. Park Seong is an experienced teacher in the private school who acts as the mentor to Ha-neul. Do Yeon-Woo is a Korean language teacher who is popular with the students.