In the imperial capital of the Tang Dynasty, the mysterious Li Bing is appointed Assistant Minister of Dali Temple. With a team of eccentric investigators, he unravels complex cases.
After waking, Chen Shi is saved by Li Bing, who claims to be from the Court of Judicial Review. Wanted as suspects in the demon cat case, Chen Shi asks Li Bing to help an orphan find her family.
The orphan’s past links to a three-year-old demon cat case wrongly concluded. Li Bing decides to reopen both cases. While investigating, they encounter General Qiu Qingzhi, hinting at a shared past.
Li Bing stages a hostage act to guide Mingjing Hall in reconstructing the crime, proving it man-made. However, Qiu Qingzhi seizes the case, while Li Bing locates the real suspect.
As the truth nears, the mastermind appears powerful. Li Bing confronts the suspect as Qiu arrives with troops. Li Bing and Chen Shi escape by lantern, only to find an unexpected guest onboard.
After solving the case, Li Bing is promoted to Shaoqing. He sneaks into the guards as a white cat, is injured by Qiu, and his identity is revealed to Chen Shi, who vows to keep his secret.
Chen Shi becomes Li Bing’s clerk. Reviewing cases, Li Bing finds negligence in Mingjing Hall. A woman appeals an unresolved case, and Li Bing orders a reinvestigation to decide everyone’s fate.
Following clues, Li Bing enters an underground arena and gains a mysterious mask tied to his identity. Meanwhile, the reopened case stalls despite complete evidence, suggesting hidden truth.
Li Bing finds key leads from the mask. Rechecking the case, he spots inconsistencies and retrieves files for review. Realizing danger, they rush back to protect the victim’s sister.
Just as progress is made, the suspect dies in prison. Clues point to Qiu’s involvement. Tracking leads, Li Bing confronts Yizhihua in battle until Qiu arrives at the city gate.
A couple claiming to be Li Bing’s parents appear but are exposed as Wang Qi’s parents. Meanwhile, Li Bing attends the imperial banquet, where a masked performer draws suspicion.
Wang Qi pretends to be Shaoqing for his parents. Chen Shi seeks his brother. At the banquet, the masked performer secretly confronts Li Bing. A murder at the dock soon draws attention.
A strange corpse is found inside a dragon statue. Investigations stall as clues are erased. Li Bing tracks the culprit, who kidnaps Chen Shi and escapes, though Li Bing continues pursuit.
Wang Qi and others infiltrate a warehouse but are captured. Rescue fails as ships are cut loose. Disturbed, Chen Shi receives a letter from his brother and decides to leave.
While searching for his brother, Chen Shi uncovers key clues. Li Bing learns of a mysterious drug. After setbacks, Chen Shi chooses to stay, while Shangguan clashes with his father.
Li Bing and Chen Shi discover the victim took pills linked to the longevity drug and uncover Hu Ji’s motives. Separate investigations reveal conflicting accounts of the victim’s life, while a new related murder occurs.
Though the case closes, new doubts arise. A hidden clue lures out the culprit, revealing a tragic truth. Li Bing senses all recent cases are connected, while strange events surround Cui Bei during Qingming.
On Qingming, Cui Bei disappears, hiding in the mountains to avoid bringing misfortune. A fugitive enters the area, and unaware of danger, Cui Bei remains trapped in his own fears.
Mingjing Hall tracks a murdered thief’s victim, uncovering past grudges. Sun Bao clashes with the victim’s owner and leaves alone. Authorities intervene, Sun Bao is arrested, and clues hint at hidden truths in an old war.
Sun Bao escapes but is attacked. Li Bing secretly teams up with Qiu Qingzhi to investigate, revisiting the war mystery. A strange children’s rhyme spreads, and Chen Shi finds a young woman’s corpse in salt.
Two women are murdered similarly to an old unsolved case. Investigation reveals a larger human trafficking plot tied to the drug. Wang Qi disguises himself to infiltrate a brothel with Li Bing.
Following clues, Li Bing confronts a suspect and transforms after contact with blood. A strange statue appears, and the eerie rhyme keeps coming true. Li Bing secretly investigates the guards again.
Li Bing realizes the cases are deliberately linked, with “cat” tied to both crimes and his identity. He leaves the capital with Chen Shi to investigate, but they are ambushed, deepening the mystery.
Escaping danger, they find clues on an abandoned ship. At Li Bing’s old home, key evidence emerges, but Qiu Qingzhi intervenes. Meanwhile, Mingjing Hall is surrounded, forcing both sides into confrontation.
As truths of an old assassination surface, the killer reappears to target Li Bing. Qiu Qingzhi blocks the attack. The culprit leaves clues, drawing past survivors back into the unfolding case.
Before one case ends, another begins. The killer Black Rakshasa leaves clues and targets past survivors. Chen Shi goes missing, while Shangguan Qin uncovers her father’s dark secret.
Allies help Shangguan Qin escape but face ambush. Li Bing confronts Black Rakshasa and learns the truth of his father’s death. The emperor suspends him, and Lai Zhongshu takes his position.
Stripped of power, Li Bing watches Lai Zhongshu take over. Chen Shi falls into despair. Mingjing Hall rebels but is punished, and all are expelled from the court, leaving the capital.
A demon cat appears in the palace, angering the emperor. Lai Zhongshu orders assassinations and imprisons Li Bing, forcing him to reveal his cat form, while the group searches for clues.
Li Bing survives and is rescued in cat form. Hiding in a ruined temple, past mysteries are revealed. Injured, he recalls his youth with Qiu Qingzhi while drifting in and out of consciousness.
With all wanted, the group relocates. Li Bing rescues Shangguan Lian and learns the truth behind the war and his father’s death. They unite to find Yizhihua and uncover the full conspiracy.
A plan to lure enemies fails as members are captured. Li Bing traps Yizhihua, revealing hidden identities, but Qiu Qingzhi arrives, and all fall under control as past war secrets emerge.
Rescued from execution, they escape into an old prison. Li Bing transforms and flees, later mistaken as a monster. Meanwhile, Qiu Qingzhi pressures the emperor to act.
Returning by lantern, they infiltrate the palace. An ambush strikes as Li Bing confronts Qiu Qingzhi. Entrusted with a mission, Li Bing investigates the old war, as truths begin to surface.
Li Bing briefly subdues Yizhihua, but Lai Zhongshu appears. Everyone is captured, leaving Chen Shi alone. Facing overwhelming odds, he leads civilians in a desperate rescue attempt.
