The two girls born in 1988 spent their childhood together with he en, and experienced quite a tortuous relationship in the process of growing up into adults. When they were in their teens, a slight rift appeared as he en and his classmate Zhenyu began to fall in love for the first time. A free and unrestrained smile went to the city to pursue an adventurous life, while he en stayed in his hometown to live a stable life, so the two drifted apart.