When corrupt officials prevailed in this dynasty, when all unfair things happened in this world, shadows walked on both ends of the dark side and the light side. In a profession that is divided into black and white, the shadow can sneak into every corner and explore everything in the world. The shadow can confuse all eyes and complete the task quietly. Everything that passes must have its shadow. Things you don't want people to know are hiding in your shadow, and this profession is about living in the shadow. Bai Lin is a special shadow who does things as he pleases and doesn't worry about worldly matters. He is the most dashing shadow, the most invisible shadow, and the boldest shadow.
However, when the target sneaks into the darkness and the shadow blends into the darkness, Bai Lin, who is a shadow, slowly loses his direction...