Xun Yin

Biodata

Background / History

Xun Yin attended the police university, where Pei Qingyu observed him during the Special Case Team’s recruitment selection after his tracking and investigation test. He already knew about Pei’s poor sense of direction before joining the team. Although Pei remembers the university selection as their first meeting, Xun later indicates that he remembers an earlier encounter without explaining it 25 49.

After joining the team, Xun was treated by Pei as a younger colleague who needed looking after. Their roles gradually reversed after Pei suffered a gunshot wound through the chest, fell into a river, and developed lasting heart problems. By the Lin Zhou investigation, Xun had spent half a year caring for him 1 2 8.

Following another hospitalization, Pei moved into Xun’s home. Pei Qingyan thanked Xun for taking his brother in and told him to regard them as family 17.

Appearance

• Height: Half a head taller than the 180-centimeter Pei Qingyu; no exact height is stated 18.
• Features: Handsome brows and bright eyes. His usually stern expression makes his occasional smile look especially youthful 25.
• Scent: Pei notices a faint pine scent when leaning against him 25.
• Clothing: Owns a police uniform and a long black coat. For the Zhu family banquet, he borrows a suit from Pei Qingyan 34 50.

Personality

Xun is reserved and intensely focused on work. His routine largely consists of investigating cases and training, with few hobbies; Pei sometimes takes him out because he considers him too withdrawn. Xun generally cares little about other people’s impressions, but specifically wants to know whether Pei thinks he looks fierce 16 25.

His devotion to Pei combines professional faith with increasingly explicit romantic affection. He insists that Pei’s illness has not changed the captain he believes in. Nevertheless, Pei’s teasing readily leaves him blushing, and he initially conceals his feelings out of fear that a confession might cost them their existing closeness 4 31.

Xun’s protectiveness can become anger when Pei conceals dangerous symptoms or risks his life. He repeatedly blames himself for failing to keep Pei safe, even when Song Xuanmo assures him that he has already done well. Despite this anxiety, he can steady himself and give clear operational instructions during emergencies 5 29 33 34.

Abilities & Skills

Firearms

Xun’s familiarity with firearms is described as the best in the police station, and Pei openly considers him the better shot 36 40.

• Shoots Zhuo Wumian in the knee during their confrontation at the shipping containers 14.
• Provides covering fire while Pei crosses the underground hall, then throws him his handgun so they can reverse roles 37.
• Responds immediately to Pei’s directional warning and shoots an approaching gunman 40.
• His expertise is not infallible: during Russian roulette, he fails to notice that the gun contains nonstandard ammunition, despite Pei assuming he must have recognized it 36.

Close Combat and Mobility

Xun uses joint locks, throws, and rapid movement to restrain suspects and navigate difficult terrain 12 18 34 47.

• Catches an attacker’s punch and coordinates with Pei to drive him into a cord trap 11.
• Evades a stairwell ambush, twists the attacker’s wrist, and pins him against a wall 12.
• Restrains the aggressive woman at the mercury-poisoning scene without shooting her 18.
• Climbs onto a roof using the eaves and an adjacent wall to enter the concealed underground bar 34.
• Subdues and handcuffs Zhou Yang after the latter attacks him 47.

Investigation and Leadership

As deputy captain, Xun directs follow-up work and coordinates with the team when Pei is unavailable 7 8.

• Suggests that salt water at Lin Zhou’s murder scene was intended to resemble air-conditioner condensation 4.
• Discovers the nearly invisible thread used in the murder setup 10.
• Identifies possible mercury poisoning and orders the bathroom sealed and ventilated 19.
• Anticipates Pei’s intended identity verification and requests hospital testing before Pei regains consciousness 29.
• Orders fresh headsets when existing equipment may be compromised, arranges remote support, and requests discreet narcotics-unit assistance 34.
• Connects Song Sheng’s whispered instruction to a concealed listening device and directs the separation of Zhuo-related evidence into its own file 44.

Caregiving and Emergency Assistance

After months of caring for Pei, Xun becomes practiced at recognizing his symptoms and assisting him through attacks 5 8.

• Carries Pei’s emergency medicine and administers it when needed 7 32.
• Checks his pulse, helps control bleeding, and rebandages wounds 15 45.
• Moistens his lips, supports him during coughing fits, and helps keep him warm 8 18.
• Rescues him from a burning restaurant and repeatedly carries him to medical care 7 27 29.

Equipment / Weapons / Items

• Handgun — Used in armed confrontations, covering fire, and the underground bar’s survival games 14 36 37 40.
• Handcuffs — Used to secure suspects including the poisoned woman, Song Sheng, and Zhou Yang 18 27 47.
• Communication headset — Connects him with field teammates and remote support; signal jamming interrupts contact inside the underground bar 34 36 50.
• Pei Qingyu’s emergency medicine — Begins carrying a supply after one of Pei’s attacks 7.
• Black coat — Leaves it in the car specifically for Pei to use as a warm blanket 34.
• Scalpel — Brings one for Pei during the underground bar confrontation, knowing that he does not normally like carrying a gun 36.

Relationships

• Pei Qingyu — Captain, housemate, and romantic interest. Their working partnership relies on years of practiced coordination. Xun recognizes that his feelings exceed professional respect, but fears losing their closeness; Pei’s habit of treating him as a younger colleague initially complicates his attempts to approach him romantically 17 31 40.
• Pei Qingyan — Pei’s elder brother and a narcotics officer. Shares information with Xun about Zhuo Wumian, welcomes him as family, and entrusts Pei’s care to him. Xun comes to address him as “Brother Yan” 17 42 43.
• Song Xuanmo — Pei’s doctor and Xun’s principal medical contact. Updates him on Pei’s condition, performs requested tests, and reassures him about his caregiving 16 29 42.
• Song Ranran — Teammate who provides research, technical support, and investigative updates. Her advice about relationships developing gradually influences Xun’s approach to Pei 8 31 34 44.
• Lin Shichu — Fellow investigator whom Xun calls “Brother Lin.” Assists with company surveillance, suspect handling, and the team’s continuing investigations 8 10 47.
• Wang Yu — Teammate who follows Xun’s field instructions and supplies backup. His assumption that Xun is always beside Pei contributes to confusion when Pei enters the bar district alone 33 34.
• Su Xiaochen — Pei’s forensic pupil. Helps Xun provide emergency care after the shipping-container confrontation 15.
• Zhuo Wumian — Antagonist who targets both Xun and Pei, exploiting their willingness to sacrifice themselves for each other. Forces Xun to accept a condition that he may love Pei but never have him 14 41 42.
• Zhou Yang — Hostile acquaintance of Pei’s. Xun arrests him after his insults and violence, then rejects his interference in their private relationship 47.

Story Role / Major Arcs

Lin Zhou Shooting Investigation

Xun accompanies Pei on his return to fieldwork, helping investigate the saltwater evidence and the victim’s habits. When Shi Qian sets his restaurant on fire, Xun pours water over himself, enters the burning kitchen, and carries Pei out. Although he initially wants to accompany him to hospital, Pei reminds him that he must lead the team in his absence 2 4 7.

At Lin Zhou’s workplace, Xun discovers a transparent thread and works with Pei to ambush two intruders. Pei saves him from a gunshot and later shoots a knife from another attacker’s hand. Their pursuit leads to Zhuo Wumian at the shipping containers, where Xun wounds Zhuo but is grazed in return. Zhuo escapes beneath the bridge, leaving Xun to return to the critically ill Pei 10 11 12 14 15.

Mercury Poisoning and the Sisters’ Identity Switch

During the investigation of a blood-soaked apartment, Xun restrains the surviving woman and recognizes possible mercury poisoning. He later tracks Song Sheng through a factory site while guiding the directionally challenged Pei 18 19 25.

The pursuit leaves Xun’s hand injured by sulfuric acid. Despite the untreated injury, he catches Pei as he falls from a bridge and holds him above the reservoir. When Song Sheng begins waking below, he follows Pei’s plan and throws him toward the concrete platform, allowing her recapture 26 27.

Xun subsequently arranges testing to verify the sisters’ identities, presents evidence during questioning, and pursues the missing syringes. After Pei suffers a severe episode, Xun confronts him about concealing his PTSD 29 31 32 33.

Underground Bar and Zhuo Wumian’s Wager

Xun follows Pei into a concealed underground bar and joins a lethal gambling game. He turns the Russian-roulette weapon on the bartender, then fights alongside Pei through armed attacks and an expanding electrified floor 34 35 36 37 38 40.

Zhuo reveals that Pei surrendered his medicine in exchange for Xun’s survival and endured an electric current to recover the syringes. With Pei unconscious, Xun offers his own life in exchange. He ultimately accepts Zhuo’s demand that he love someone he can never have, securing permission to carry Pei out 41 42.

Afterward, Xun continues coordinating the investigation while awaiting Pei’s emergency surgery. Although relieved by his survival, he becomes noticeably restrained around him; Pei interprets the unfamiliar distance as lingering anger 44 45.

Zhu Family Banquet Investigation

Xun defends Pei when Zhou Yang insults their relationship and attacks them. He later admits that he learned the law from a recording of Pei reciting it—a recording Pei does not remember 47.

As the next investigation develops, Xun becomes jealous of Zhou Yang’s long acquaintance with Pei. Pei reassures him that meeting Xun at the public security university was his own choice. They then prepare to attend the Zhu family banquet together, supported remotely by Song Ranran and Wang Yu 50.

Notable Quotes

“Xiaochen needs your guidance. The Special Case Team needs your leadership. Everyone needs you.” 4

“I just thought I could protect him... at least do better than this.” 29

“Let me take him out of here, and I’ll agree to your terms.” 42

“Even if the captain and I really were together, what business would it be of yours?” 47