In pursuit of love, Suzhou girl Cheng Zixin (played by Gao Yuanyuan) came to Hong Kong with her boyfriend and worked in a financial company. Unexpectedly, her boyfriend fell in love with someone else, which hit Zixin hard. By chance, she met the architect Fang Qihong (played by Daniel Wu) who was in a bottleneck period. The two encouraged each other. Zixin lost everything about her ex-boyfriend. Qihong also decided to start again and agreed to show Zixin the latest design drawings a week later. Unexpectedly, Zixin missed the date that night. It turned out that opposite Zixin's office, the boss of another company, Zhang Shenran (played by Louis Koo), had been watching her for a long time. During her loss, the two communicated through colored stickers, and Zixin gradually fell in love with this big boy. Zixin forgot the appointment with Qihong and made an appointment with Shenran to meet in a cafe, but Shenran slept in another woman's bed. Due to a series of mistakes, the fate of the three people was temporarily interrupted. Until one day three years later, the unfinished love continued...