As a migrant worker in Beijing, Liu Xiangxiang has a funny personality, but she is kind-hearted and sincere. When her superiors assigned her a project, she was repeatedly made difficult by her colleagues in order to laugh at her. Xiangxiang was a little desperate and lost hope in life. She lay in the bathtub, her head sinking into the water little by little. At this time, a thunder sounded and hit Xiangxiang's body. Xiangxiang lost consciousness and traveled to the Great Chu Kingdom. She became a dying assassin and had four opportunities to assassinate Prince Mu Chunshen. If she failed, she would die of poison. In order to complete the assassination mission, she transformed into a maid, a guard and a beggar boy in the prince's mansion. Whenever the assassination was about to succeed, unexpected things would happen, catching people off guard. In the process of fighting wits and courage with Mu Chunshen, Liu Xiangxiang gradually discovered Mu Chunshen's kindness and sense of responsibility. She began to shake her determination to assassinate and slowly fell in love with Mu Chunshen. At the same time, she realized that there was a past hidden behind this assassination mission, which was about the cause of death of Mu Chunshen's elder brother, the former crown prince Mu Liu. So after secretly discussing with Mu Chunshen, they staged a trick to lure the enemy into a trap, and all the truth finally surfaced...