Episode 4 S01 E04

Kim Hee-ae (as Oh Hye-Won) Yoo Ah-in (as Lee Sun-Jae) Park Hyeok-kwon (as Kang Joon-Hyeong) Kim Hye-eun (as Seo Young-woo) Jang So-yeon (as Se-jin) Kim Kwon (as Woo-sung) Shim Hye-jin (as Han Sung-Sook) Kim Chang-wan (as Dean Min Yong-Ki) Gyeong Su-jin (as Park Da-Mi) Kim Yong-geon (as Seo Pil-Won) Shim Ji-ho (as Ji Min-Woo) Jang Hyun-sung (as Kim In-Kyum) Baek Ji-won (as Secretary Wang Jung-Hee)

infidelity love teacher student relationship older woman younger man relationship rich man poor woman societal ignorance