On a rainy night in Binhai City, criminal police captain Tang Long investigates a strange murder case: the body of a girl Lin Xiaorou is found in the bathroom. The scene is covered with broken mirrors engraved with "19980723". The case is strikingly similar to an unsolved case from 25 years ago. Deputy Director Chen Mo's obstruction and the pursuit of the mysterious man in black imply that there is a hidden secret behind it. Everything started with the Jingyuan experiment.
