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Gwang Soo, a promising teenaged swimmer, skips training regularly because he is overconfident of his ability. His violent coach gives up on him and Gwang Soo quit swimming. Years later, Gwang Soo works as a swimming instructor. Elementary school boy Joon Ho always ranks 4th in competitions, making his mom impatient. She looks for a personal trainer and finds Gwang Soo.

A suspenseful melodrama of a cruel obsession in the name of love between a man (Jang Hyeok) who lived an ordinary life and a fearless girl (Jo Bo-ah).

Luo Ou and Tang Mi are brother and sister, one with their father's surname and one with their mother's surname. Their parents passed away early, and the siblings have lived together. Over time, Luo Ou was discovered by a scout and became a rising star, while his sister Tang Mi lived and ordinary life. Luo Ou suddenly got into a car accident and became unconscious. In order for her brother's dream to continue, Tang Mi takes on her brother's identity and joined the crew. Entering the crew Tang Mi, met senior of the crew Yang Han again. At this time, Yang Han was already famous, and he didn't remember the school girl. Yang Han paid great attention to this motivated young and healthy young man, but the paper could not cover the fire. He soon discovered Tang Mi ’s “secret”, but a series of misunderstandings made the two fall for each other.

Ji Sub is coming back home after an unsuccessful audition. Suddenly, a sound makes him stop his car. When he opens his trunk, he discovers young woman, Yeon Hee, who doesn't remember anything about herself. Who is that girl and why did she appeared in front of Ji Sub?