Ha Eun (Do Ji Won) is a 36-year-old housewife with a teenage daughter and a husband (Park Sang Wook, The Restless) who is a K-1 champion. Docile and gentle in nature, Ha Eun endured 13 years of physical abuse from her controlling and violent husband. But upon witnessing her husband assaulting her own child and causing the death of her friend, a shred of reality sets in and her search for the path to freedom begins. During her husband's K-1 press conference, Ha Eun lashes out against him, boldly inviting him to a K-1 challenge. Only three months till the fight but with most gyms refusing to accept any females, Ha Eun finds herself at loss until reluctant help arrives - Soo Hyun (Son Hyun Ju, My Rosy Life), a scruffy-looking ex-math teacher who has never lifted a finger at anyone in his life. But Soo Hyun comes to believe in her and becomes her unlikely coach, passing down the techniques he learns the night before at a training gym to Ha Eun the next day. No longer a damsel in distress, Ha Eun gets ready for payback time!