All Yuan Zhinan has left behind when she passed away is a letter and an invitation to a school reunion. Attending the reunion in lieu of her late elder sister, Zhihua accidentally runs into Yin Chuan, on whom she had a crush in her youth. As old memories are evoked, and correspondences travel through different contexts and times, Zhihua slowly uncovers the intricate story of the trio.
Zhou Xun
Yuan Zhihua
Qin Hao
Yin Chuan
Du Jiang
Zhou Wentou
Zhang Zifeng
Saran / Young Zhihua
Deng Enxi
Mumu / Young Zhinan
Bian Tianyang
Young Yin Chuan
Wu Yanshu
Chen Guizhi
Tan Zhuo
Ji Hong
