The Main Cast

There’s a total of 6 players for every case
The players contain 3 to 5 main cast members and 1 to 3 irregular cast members or guests

The main cast
The main cast members are players who appear in almost every single case with the exception of conflict in schedule, lacking need in character (for example when the case has only 1 female character) or to make room when there are two or more guests

He Jiong
Detective He is the oldest member of the cast and is known for his perfect explanations and logical reasonings
His reasonings are always so perfect which makes him suspicious at the same time
His strenght is figuring out the motive and psychological behavior of every player
Succes rate as detective: 50%
Succes rate as murderer: 62.5%
S1: All cases
S2: All cases
S3: All cases
S4: All cases

Sa Beining
Detective Sa is known for his legal/law related shows
He knows the most about the current laws and real murder cases
This however doesn’t affect his reasonings on the show
He’s known as the Doghead (Good for nothing) detective and Bright Light on the show
The light that shines on the path of others
Despite having the lowest succes rate as detective, he has the highest succes rate as murderer
Succes rate as detective: 42.5%
Succes rate as murderer: 83.3%
S1: All cases
S2: All cases
S3: All cases
S4: All cases

Bai Jingting
Detective Bai who is also known as Xiao Bai or Little Bai is the youngest member,
but also the brain of the main cast
Bai started out as a guest member, but became the main cast later with Da Zhangwei after receiving great reactions of viewers
His strenght is locked room cases and finding the murder method
His intellegence has solved many cased, but also caused him to be wronged to be the murderer many times as well
He became a special PD once and participated in the creating process of the 6th case “Unable to Triumph in the Skies Again” in season 3
Succes rate as detective: 87%
Succes rate as murderer: 66.7%
S1: 1, 2, 3, 7, 8, 9, 12
S2: 1, 2, 3, 4, 5, 7, 8, 11
S3: 1, 4, 7, 8, 9, 10
S4: 1, 3, 5, 10

Guigui (Wu Yingjie)
Detective Gui is the mood maker and evidence dog of the team
Every place she goes brings a smile on everyone’s face
She’s clumsy, loud, childish, but also really funny
This however does not make her useless
Detective Gui is really good at finding the most important evidence
Especially finding keys
She often gives a fresh look during the reasoning and doesn’t get swayed easily by others (With the exception of Sa)
She has a great intuition and is someone that you easily underestimate
Succes rate as detective: 44.8%
Succes rate as murderer: 50%
S1: All cases
S2: 1, 4, 6, 7, 10, 11
S3: 1, 2, 3, 4, 6, 9, 10
S4: 2, 4, 8

Detective Ou has the second highest succes rate as detective after detective Bai
Despite not having the greatest reasonings of the cast,
she almost always manage to get the culprit right with pure intuition
Succes rate as detective: 83.3%
Succes rate as murderer: 33.3%
S1: 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12
S2: 3, 4, 5, 6
S3: 4, 6, 7, 8
S4: 1, 2, 4, 5, 7

Former cast members

Qiao Zhenyu
Detective Qiao was introduced as a main cast member in season 1
However due to the conflict in schedules he decided to step out and became an irregular guest instead
Detective Bai and Detective Da who received great reaction of viewers took his place
S1: 1, 9
S2: 5
S3: 6
S4: 9, 8

Detective Da made an appearance for the first time in S1 Case 2
After Qiao Zhenyu stepped out of the main cast,
Detective Da took his place together with detective Bai due to the great reaction of viewers
For an unknown reason, Detective Da stepped out of the cast after the first season
He however joined Who’s the Keyman, the spin off show of Who’s the Murderer as one of the main cast in 2018
S1: 2, 3, 5, 10, 11, 12
S2: 2, 10
S3: 11
S4: 10