In an effort to support her family, Kang Joo-eun has become a workaholic lawyer without any regard for her personal well being. Overweight, unattractive and depressed at the prime of her life, Joo-eun comes across Kim Young-ho, a renowned personal trainer who considers health a deeply personal calling. Can Young-ho and his stubborn perfectionism whip Joo-eun’s body—and heart—back into shape?