Lieutenant senior Lee Soon-shin and female lieutenant junior Kim Yoo-shin.
When her brother and his wife died in an unexpected accident, Soon-shin who returned from the United States to take care of her nephews, collided with Yoo-shin, who lived next door, and was misunderstood as a sexual harasser. Yoo-shin never dreams that he is the uncle of the children next door and that he will come to the unit where she works as a supervisor.