One

In which after being childhood friends for a few years, Sung Hanbin and Zhang Hao have now become the biggest enemies. After Hanbin moved away, they hoped to never have to see each other again, but what happens when Zhang Hao's mom starts having financial problems, making them suddenly have nowhere to live?

What happens when Zhang Hao is told he and his family will be moving into Sung Hanbin's house since their mothers are best friends?