Young Detective Dee: Rise of the Sea Dragon

660 AD, a mysterious sea monster devastates the Chinese fleet in the East China Sea, leaving ships shattered and sailors reeling. The attack triggers an urgent imperial response and the start of a perilous investigation. The event establishes the scale of the threat facing Luoyang and the court.

Empress Wu Zetian orders Yuchi Zhenjin of the Ministry of Justice to uncover the creature's origins and end the threat within ten days. She warns that failure will bring harsh consequences for the conspirators behind the attack. The directive tightens the deadline and channels court effort toward a swift resolution.

Dee Renjie arrives in Luoyang after earning a place in the Court of Judicature, quickly entangled in the capital's intrigue. He navigates rival factions and shadows of conspiracies as he moves closer to the monster case. His fresh perspective makes him both a suspect and a key ally for the investigation.

Dee overhears a plan to abduct the offering meant to appease the sea monster—the courtesan Yin Ruiji—and he acts to intervene. He fights off the initial kidnapper and later saves Ruiji from a second humanoid intruder. The rescue binds Ruiji to Dee and deepens the mystery surrounding the threat.

Yuchi Zhenjin arrests Dee on suspicion of colluding with outsiders, and Ruiji is placed under protective custody. In prison, Dee forms a bond with medical assistant Shatuo Zhong, whose healing skills prove crucial for their escape. Their breakout marks a turning point in the case as they join forces outside the prison walls.

The creature haunting Ruiji visits again, and she slowly realizes it is her missing lover, Yuan Zhen, a tea manufacturer. Masked thugs strike their refuge, forcing Dee, Yuchi, and Shatuo to rush to defend them. The revelation links personal loss to the broader conspiracy driving the monster's appearances.

Dee reaches the scene but is ambushed by Yuan, who has been hiding on the eaves. Ruiji lashes out and stabs Dee, threatening self-harm, which compels Yuan to flee. Ruiji later confides the truth about Yuan to Dee, clarifying the complicated bond between the lovers.

Piecing clues together, Dee suspects the attackers come from the war-torn nation of Dondo and aim to poison the imperial tea to topple Emperor Gaozong and his court. He, Shatuo, and Ruiji track Yuan to a hidden lair and prepare to intercept the conspiracy. The investigation widens from a creature of myth to a political plot.

Dee, Shatuo, and Ruiji bring Yuan to the imperial doctor Wang Pu, who administers a sedative to stabilize him. Wang Pu uncovers that Yuan’s disturbing transformation is caused by dung beetles and poison effects. He crafts an antidote that can be distributed to the entire court, averting catastrophe.

Dee and his allies uncover a traitor within Da Li Si and confronts the sea monster—an enormous manta ray mutated by Dondo through parasites and poison. The investigation threads together political betrayal with the creature’s unnatural menace. The dual threat binds political treachery to the creature's attacks.

Using Yuan's clues, Dee and Yuchi pinpoint a hidden island where the rebels are rallying. They land at night and prepare for a strike against the insurgents. The mission marks a decisive turning point in the capital’s crisis.

In a brutal night battle, Dee, Yuchi, and Ruiji face the rebels and kill Huo Yi, the rebel leader. The victory weakens the anti-imperial faction and tightens the court’s grip on power. Yuan’s loyalties and Ruiji’s safety are resolved in the aftermath.

On their return, the sea monster again menaces the imperial fleet. They deploy poisoned fish bait, drawing the creature in and watching it die as the poison takes effect. The crisis recedes, and the court breathes a sigh of relief.

The Da Li Si emerges victorious, and the Emperor honors Dee with the Dragon Taming Mace while naming him the new head of the department. Dee’s ascent consolidates the reforming power of the Court and signals a new era of justice. The victory also stabilizes Luoyang after the troubling events.

Following Dee’s counsel, the cured Yuan and Ruiji choose to flee the capital to avoid further conflict with the Empress. The capital settles into a fragile peace as Dee guides the Da Li Si toward stabilizing the realm. The court closes the case with a wary calm.