Red and Blue Cordon

Four police partners with very different personalities, four "plastic sisterhoods" with hidden secrets, and the darkest criminal network in a city. Criminal investigation detachment leader Qi Wei and forensic expert Zhang Yuqi have been partners for seven years, but suspicions gradually arise over an old case; Criminal profiler Li Yitong and newly-minted policewoman Tian Xiwei appear to be masters and apprentices, but actually have their own agendas; Li Xueqin, a network security technician, and Zhang Yifan, the ace of the SWAT team, have very different personalities but are forced to live together to handle cases; Twin undercovers Lin Momo and Lin Feifei, one in the light and the other in the dark, their identities as sisters have become the most dangerous cover. When four groups of partners were transferred into the newly formed "Red and Blue Special Operations Group" at the same time, they discovered that each pair had received the same threatening letter: "I know your secret." All clues point to a covered-up mass disappearance fifteen years ago... They must resolve the crisis of trust between their partners before they can tear apart the city's deepest darkness. But when the truth is revealed, will anyone be able to walk out of this red and blue cordon alive?