In the time of the Qing Dynasty, the Emperor Yongzheng created a secret army known as the Guillotines. It was the job of the Guillotines to protect the Emperor by killing anyone who posed a threat to him or his rule. After 348 successful missions to eliminate their target, the 349th assignment proves to be their last.

A memorial service for Fei Ke brings together female journalist He Shan and four strangers who are invited. They all share undisclosed pasts with Fei Ke, but they discover that the Fei Ke they knew is not the same person. Who is Fei Ke really? As they look back, the group gradually uncovers the truth about Fei Ke.