He is the source of all evil and the end of all tragedy.
Pei Yunshu, a sickly genius recognized by the whole school, just wants to spend the rest of his life quietly in the shadows. Until four strange "black cat" serial murder cases cut through the tranquility of the city like a sharp blade.
Officer Chen Feng discovered that all the deceased shared the same secret with Pei Yunshu - they all came from the primary school called "Shuguang" in the west of the city. And this seemingly pure and fragile young man has become the most important "fifth cat" in the eyes of the murderer.
The real culprit behind the scenes, Li Lei, a ghost who crawled out from the shadow of his childhood, personally issued a death invitation to him: "Try to stop me, otherwise, the result will be death."
In order to survive, Pei Yunshu had to step into this intellectual game with life as the bet. He used psychological insight beyond ordinary people to tear apart the murderer's disguise step by step, only to find that all the clues pointed to the past he wanted to bury most - his violent father who had been buried in the sea of fire.
The truth, however, is a despair deeper than murder.
When the secret of Lin Yuqing, the only white moonlight in his childhood, was revealed, and when twisted love and deep-seated hatred intertwined into a web, Pei Yunshu discovered in horror: He thought he was chasing the murderer, but in fact, he was walking step by step into the final altar carefully prepared by the murderer for him.
This is a death game with no winner. When the birthday candles turned into flames that burned everything, and when the penitent letters drifted away in the wind, all that was left to him was a completely destroyed world and endless sorrowful ashes.
"The Fifth Cat" - When the ghost that peeked at your childhood returns, how will you face the rusty truth...
