Freshman Zhang Xiaoshan went to Peking University to study alone. On the way, she met train conductor Shan Hao. Two chance encounters on the train made Shan Hao develop feelings for Zhang Xiaoshan. Sun-ho is actually the only son of the chairman of Lotte Real Estate. When the senior who was picking up freshmen left due to something, Li Qi took the senior to pick up his classmate Zhang Xiaoshan, and they fell in love with each other. The two lived upstairs and downstairs, and they had a sweet love upstairs and downstairs. However, Li Qi's family was poor, and Zhang Xiaoshan's family was rich. Their family backgrounds were as different as their love, one was upstairs and the other was downstairs...
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