They are each other's moonlight, but they are separated forever after a night of nightmare. Tang Ran exchanged his soul for the power to protect Pei Yin, but was completely forgotten by the world. Many years later, Pei Yin retrieved her memory and recognized each other in tears, but could only watch her disappear in the wind. This is a sacrifice in the name of love, and it is also a watch that is destined to have no return.
Purpose: Sacrifice and protection