St. Louis School has started. There are surprisingly many girls this year, and there are not enough girls' dormitories. So the daughter of the Lan family (Lan Xiyao) and her best friend Han Shizhi both moved into the boys' dormitory. Here they met the most important men in their lives - the cold-hearted Young Master of the Yin family (Yin Liangjie) and the gentle and sunny Shangguan Youye... However, due to the entangled love and resentment between the two families, Lan Xiyao and Yin Liangjie ended up like two parallel lines, one going east and the other going west, never ending...