The heroine traveled to ancient times and met two young masters of the Su family. Besides, these two young masters had no feelings on the surface but cared about each other more than anyone else. The heroine dated the second young master but was abandoned, thinking that she liked the eldest young master. She left the Su family and was taken in by the kind-hearted Shadow boss and trained as a female killer. By chance, she received a mission to assassinate the second young master. When she returned to the Su family, she found that the eldest young master had died. She drank with the second young master in the back garden at night and killed the second young master. When she returned to Shadow, she received a letter...