Chen Ju Yi, a divorced elementary school physical education teacher, bought a big house with all his savings, and just moved in with his daughter. But one day, strange woman opens the door and claims that the house was hers, and after the two argued, they learned that they had fallen into a trap of "one room, two sales". The woman's name is Fang Ling, she's the brand director of an international clothing company, beautiful in appearance, divorced due to her husband's cheating, and living alone with her six-year-old son. Neither of them, wants to gave up their house, so they follows some legal advices and temporarily starts living under one roof. But very soon, Chen Ju Yi and Fang Ling starts "guerrilla war", both wanting to kick each other out, from the house. However, they don't expect that soon, due to many life perturbations, the couple will become the greatest support for each other.