S01 Episode 1
Unriddle
Zhang Yuze informs Xiao Man that his former girlfriend, Ivy, was murdered and he can't forget her.
43 mins
S01 Episode 2
Unriddle
Hu Xiao Man catches Zheng Yi as she's running away but Zhang Yuze interrupts the confrontation to tell her that Zheng Yi is his informant. Zheng Yi watched someone die because of her and she refuses to ever be someone's mole again.
44 mins
S01 Episode 3
Unriddle
Yuze, Andrew, Zhirong and Wu Guosheng gather to pay their respects to their former partner Old Cai who was murdered fifteen years ago. Zhirong informs Yuze that he has a feeling he's being followed by Wu Guosheng.
43 mins
S01 Episode 4
Unriddle
Zheng Yi witnesses Yuze chasing Shan Fan. Shan Fan is caught and tries to bribe Yuze into letting him go. Zheng Yi is distracted and when she tries to locate Yuze, he has disappeared along with Shan Fan and the money, leaving only blood behind.
43 mins
S01 Episode 5
Unriddle
Andrew finds Zhirong searching Yuze's flat for clues. He turns up a threatening note which Andrew believes may link his disappearance to the event 15 years before. Andrew decides to tell everyone that Yuze has chosen a corrupt way of life and has disappeared with the bribe money.
44 mins
S01 Episode 6
Unriddle
Xiuling's father is captured; Xiao Man begins to investigate the case; Xiuling realises that all the things her father did were because he loved her.
43 mins
S01 Episode 7
Unriddle
Xiao Man investigates a case involving missing children who are sometimes returned dressed as dolls; she suspects that a clown has something to do with their disappearances.
44 mins
S01 Episode 8
Unriddle
Xiao Man's cold, impersonal approach doesn't always work so Zheng Yi steps up with her warm, personal way to gather the needed information. When they investigate the area where Xiao Bo went missing, they realise that Mei Yue's information doesn't match the evidence.
43 mins
S01 Episode 9
Unriddle
Xiao Man and Zheng Yi, interrogate a reluctant, nervous, obviously physically abused woman named Mei Yu to solve a stabbing murder. Zhen Bang confesses to murdering Cao Bo to save Mei Yu from her unhappy, violent marriage by using any means necessary.
44 mins
S01 Episode 10
Unriddle
A young woman named Feng Liqi falls to her death from the top of a building, nearly landing right on top of Xiao Man and Zheng Yi. Xiao Man and Zheng Yi investigate the events leading up to Cao Bo's death.
44 mins
S01 Episode 11
Unriddle
The episode opens with a very upset school teacher named Shu Zhen standing on top of a building before falling to her death. Xiao Man believes it to be a case of murder. A composite sketch of the suspect just happens to look like Zhang Yuze.
43 mins
S01 Episode 12
Unriddle
Guocheng admits his suspicions about Old Cai's death to Andrew.
43 mins
S01 Episode 13
Unriddle
Zheng Yi and Xiao Man believe that Zhong Xiao is responsible for the apparent suicides and decide to lure him out using Annie as bait.
43 mins
S01 Episode 14
Unriddle
Annie awakens at Zhong Xiao's house, realising that she has been drugged but when Xiao Man tells her to escape, she doesn't tell her that she's been drugged. The women that appeared to jump from the buildings were actually drugged and then let go by Zhong Xiao, falling to their deaths.
43 mins
S01 Episode 15
Unriddle
Xiao Man discovers Zhong Xiao's motivation for the murders. He was in love with his tuition teacher who was in a relationship with another man. Zhong Xiao bribed the man to leave her and in her sorrow, she committed suicide leaving Zhong Xiao with feelings of guilt.
44 mins
S01 Episode 16
Unriddle
Xiao Man tries to warn Zhirong but is too late. As he lays dying in her arms, Zhirong identifies the shooter as Zhang Yuze.
44 mins
S01 Episode 17
Unriddle
While tracking down Zhang Yuze, Xiao Man finds photographs of Andrew, Zhirong and Guosheng in an old building. The photos of Zhirong and Guosheng have X's over their faces and Xiao Man realises that Andrew is the next victim.
44 mins
S01 Episode 18
Unriddle
Xiao Man chases Andrew to the rooftop. Andrew shoots at Xiao Man but Dewei pushes her out of the way getting hit with the bullet meant for her while shooting Andrew.
43 mins
S01 Episode 19
Unriddle
Xiao Man goes to talk with Liu Zhiming. As she is leaving, she's attacked from behind and blacks out, waking up later in an abandoned building, handcuffed to a gate.
43 mins
S01 Episode 20
Unriddle
Zheng Yi and Xiao Man find a very sick and injured Zhang Yuze. At the hospital, the doctor says that he's been ill for a very long time--far too ill to be able to kill Andrew, Zhirong and Guosheng.
43 mins
