I’ve had enough! Let’s fight!

Ha-eyun, a 36 year-old woman who lives with her middle school daughter and her unmatched K1 champion husband, is just a normal fragile housewife of a small build who lives in fright with her husband everyday. She’s a shy wife who for 13 years of her marriage has never stood up against her husband, Ju-chang. But one day, she jumps head on into a wild predicament...
  
Ha-eun can no longer endure her husband who always plays dirty tricks in the ring and comes home transforming into a violent husband. During a press conference, she lunges at her husband Ju-chang screaming “Let’s fight!” and declares an outright war in public. Her declaration spreads across all newspaper headlines - ‘A Battle between Husband and Wife, the First in History”. Nonetheless, Ha-eun makes up her mind to enter the match by her own will which is three months ahead. Ha-eun, who has never played any sports before, decides to learn how to box and searches for a coach who will take her.
 
Ha-eun finally ends up at Su-hyeon’s Gymnasium, but Su-hyeon doesn’t look like your typical gym owner with her torn socks, disheveled hair and old trousers. Ha-eun nevertheless pleads to Su-yeon to coach her and she reluctantly gives in. But actually, Su-hyeon is an old math teacher who planned to set up a nursery school, but got scammed by her friend to buy the gymnasium. Ha-eun is her first customer.
 
Ha-eun, who went off the whim and declared a match without even having the slightest clue about fighting, and Su-heon, who only knows how to teach math, somehow become a team and go through hard training with the determination to win. The day of the match has finally come and it’s up to Ha-eun now to see if it all pays off.