An "Internet suicide note" that detonated Weibo made the death of illustrator Xia Zhi the focus of the entire Internet. The scene seemed to be a perfect suicide, but there were fatal flaws - there was a half-cup of pure milk on the table of the lactose intolerant person; under the sofa, a brooch engraved with the "human-faced bird" totem became the only evidence of homicide.
Interpol captain Lu Chen leads the team to investigate, but unexpectedly encounters Su Nian, a girl who can read people's hearts. She saw through Lu Chen's doubts with just his micro-expressions, and pointed out that "suicide is a disguise" just by looking at Xia Zhi's paintings. The two formed the most tacit detective partners. From the "weird seduction case" to the "rooftop secret", from the "abnormality of the Juewei Baozi Shop" to the "clue of the missing girl", every case is approaching the truth: all murders are related to the mysterious totems in Lu Chen's notebook and the old unsolved cases carried by Su Nian.
When the "body nailed to the wall" and the "sacrificial murder scene" appeared, Su Nian had to tear apart Lu Chen's childhood trauma - is the "human-faced bird" totem hidden deep in his memory the mark of the murderer, or the key to unlocking all mysteries?
