Lin City, the late night dock and strange symbols kicked off the RCU serious crime investigation team. Led by undercover detective Zhuang Lin, the seven-member RCU team was formed by gathering profilers, hackers, forensic doctors, fighting masters and a mysterious girl named Bai who returned from "behind the door". Every case they take on has a gap between dream and reality - from the mysterious totem dumping corpses at the bottom of the river, to the unknown existence that haunts dreams, to the old case of the "Shadow" that has been buried in dust for twenty years. When the darkness of the abyss approaches, they not only have to solve real crimes, but also protect each other and light up the faint light behind the door. In the New Year of the Year of the Horse, the darkness recedes and the light returns. The story of RCU has just begun.
