A homeless girl named Xingxing steals a chicken leg from a big yellow dog in an alley. As she hurriedly runs out of the alley, she crashes into Zhou Yuanshan's luxury car. When she falls to the ground, Zhou Yuanshan catches sight of the bright red, star-shaped birthmark on her left forehead. Twenty years ago, his newborn biological daughter had exactly the same birthmark, but then mysteriously disappeared. Doubts begin to stir in his heart. Feeling sorry for the lonely girl, Zhou Yuanshan takes Xingxing home to live with the Zhou family. However, Xingxing's arrival fills the Zhou family's eldest daughter, Zhou Qingyue, with jealousy. The family's longtime nanny, Auntie Wang, is even more alarmed when she sees Xingxing, because she was the one who secretly switched the babies twenty years ago.