The Winter Solstice.

The winter solstice bank accountant Chen Yi Ping and the criminal policeman Jiang Han can be described as two unrelated professions because a treasury theft case has linked their fate together. After the police intervened, Chen Yi Ping actively assisted in the investigation. Soon Xue Fei came into the sight of the police. Seeing that the case was a bit eye-catching, Xue Fei suddenly committed suicide. However, Chen Yi Ping, who discovered Xue Fei's secret, decided to resign and seek another job. (Source: Chinese = Douban || Translation = MyDramaList)