Yun Mengze, a Chinese-Korean mixed-race boy, came to China, his mother's homeland, and met Yu Chen, a boy who was very similar to himself, and Green Tea, a girl who always wore Chinese knots. The entanglement of the three people and the mystery of their origins began... How will the love of the Smiling Prince Shenlan, and the incomprehensible relationship between the children Wang Mingyang and Yuxuan end?