Umin-Dadau has been secretly in love with his friend Huang Yihan for years, but she always had a partner, until her recent break-up. After they go to an art exhibition together, Yihan reminds him of their past agreement, kindling the fires of hope in Umin-Dadau. The next day, however, bloodstains are found in some ruins, which are later determined to be human. When collecting the evidence, Umin-Dadau begins to suspect that the victim is Huang Yihan! She was a kind person who never mixed with the wrong sort, but the investigation shows a multiple stab wounds. What sort of deep-seated grudge would make someone take her life like this? How will CSIC solve this crime without a body?