Zhong Ke Ke rescues Tang Shao Lei from a street fight. Although she assumes that he is a "Moonlight Brother" (those who spend their money before they earn it), nevertheless, they fall in love. Ke Ke's brother, Zhong Yi Fan, becomes a taekwondo instructor since the family business wasn't doing well. He gets to know student Li Dong Dong's single mother Tang Shao Yin and the two fall in love. Later, the Zhong siblings find out that Tang Shao Lei is actually the CEO of the famous Ding Heng Corporation, and that Tang Shao Yin is his sister who ran away from home years ago. The Tang parents oppose both relationships with the Zhong siblings. Tang Shao Lei's fiancée plays dirty tricks in secret, and Dong Dong's biological father, Li Hao, shows up. How do the two pairs of lovers overcome these obstacles?