- Kim So Hyun as Lee Eun Bi/Go Eun Byul - BtoB's Yook Sung Jae as Gong Tae Kwang - Nam Joo Hyuk as Han Yi Ahn - Cho Soo Hyang as Kang So Yeong - Kim Hee Jung as Cha Song Joo - Lee Cho Hee as Lee Shi Jin
Go Eun Byul and Lee Eun Bi are identical twins, separated after one is adopted at the age of 5. Eun Bi lives at the Love House, an orphanage in Tongyeong, South Gyeongsang Province, where the younger residents look up to her as a mother figure.
However, she hides the fact that she is bullied at school by a gang of mean girls led by Kang So Yeong, while teachers turn a blind eye. On the other hand, Go Eun Byul is studying at Sekang High School, the most prestigious private high school in Seoul's Gangnam District.
Eun Byul's best friend is Han Yi Ahn, the school's star swimmer. However, only Eun Byul is aware of the other's existence. Unlike the cheerful Eun Bi, Eun Byul is prickly and secretive.
One day, on a school field trip to Tongyeong, Eun Byul mysteriously disappears. At the same time, Eun Bi is unjustly expelled from her school and jumps off a bridge in a suicide attempt.
Ten days later, the injured and amnesiac Eun Bi is mistaken for her twin, Eun Byul, and her adoptive mother takes her home to Seoul, where she starts living as Eun Byul. However, her memory soon returns.
(Not full plot)
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