Set at a prestigious private high school in Gangnam, Seoul, South Korea. Eun-byeol is a popular student at the private high school. She goes missing and returns, but she has lost her memory. She tries to find out the truth.
Elenco: Kim So-hyun , Nam Joo-hyuk , Yook Sung-jae , Lee Cho-hee , Kim Hee-jeong , Jeon No-min , Jeon Mi-seon , Kim Bo-ra , Cho Soo-hyang , Kim Min-seok , Yang Hee-Kyung , Jeong In-gi , Lee Pil-mo , Shin Jung-geun , Lee Da-wit , Kim Jung-nan , Kang Ji-woo , Lee Si-Won , Yoo-young , Kim Ye-joon , Park Hwan-Hee .