Yu Xiaogang

Biodata

Feature	Details
Name	Yu Xiaogang (玉小刚)
Alias(es)	Master
Gender	Male
Affiliation	Shrek Academy — teacher and coach in the Black World; logistics manager after the White World's academy takeover 2 69
Occupation/Role	Martial Soul theorist; instructor of the Shrek Seven Devils
Rank	Level 29 Soul Grandmaster; his cultivation has remained stalled for decades 5 69
Status	Alive; suffers a severe mental collapse after the failure of his theories and the destruction of the Blue Lightning Tyrant Dragon Sect in the Black World 148 149
First Appearance	Chapter 2

Appearance

Yu Xiaogang is a middle-aged man with an ordinary appearance, a buzz cut, and a typically stiff, serious expression. He habitually stands with his hands clasped behind his back, using the pose to project authority. During his later decline, he becomes disheveled, bloodshot-eyed, and visibly haggard. 5 39 82

• Often wears plain robes.
• Maintains a stern, lecturing posture while teaching.
• His composed facade deteriorates into an unkempt appearance after repeated public humiliations. 39 82

Personality

Yu Xiaogang initially presents himself as an authoritative, confident theorist. He believes his Ten Core Competencies of Martial Soul contain the proper path for Soul Masters and demands that his students follow his arrangements rather than improvise. He is highly sensitive to criticism, especially any challenge to his theories or reputation. 2 5 18

His devotion to teaching is genuine. He prepares medicinal baths at personal expense, gives Tang San the Twenty-Four Moonlit Bridges Night belt, leads demanding physical training, and later travels toward Spirit City in hopes of resolving Tang San's Twin Martial Soul backlash. 12 16 92 118

However, repeated comparisons with Bai Tang San push him toward denial and desperation. Rather than revise his conclusions, he attempts to claim Bai Tang San's achievements as proof of his own research. As his students begin recognizing the importance of resources, intelligence, and practical power, Yu Xiaogang becomes increasingly isolated. 39 101 122

Abilities & Skills

Martial Soul: Luo San Pao

Yu Xiaogang possesses the mutated Martial Soul Luo San Pao, a round creature resembling neither pig nor dog. 9

• Uses radishes as Luo San Pao's source of power. 8
• Can employ its sense of smell and early-warning ability during soul-hunting expeditions. 8
• Its offensive capability is associated with a fart-based attack. 9
• Luo San Pao is easily dispersed by a four-hundred-year Datura Snake, leaving Yu Xiaogang unable to protect himself without Tang San's intervention. 10

Martial Soul Theory

Yu Xiaogang's principal body of work is the Ten Core Competencies of Martial Soul. He teaches that there are no useless Martial Souls, only useless Soul Masters. 6 18

• Identifies Black Tang San as a Twin Martial Soul wielder from his Innate Full Soul Power and Blue Silver Grass. 5
• Advocates a “pure control flow” for Tang San, prioritizing Blue Silver Grass control skills and structured team tactics. 46
• Promotes the Seven in One fusion-technique theory for team combat. 2
• Insists that a fourth Soul Ring must not exceed five thousand years, despite later evidence of higher-ring possibilities. 82
• His deduction methods, theoretical limits, and claims of universal applicability are repeatedly challenged by Bai Tang San's practical results. 5 18 82

Training and Team Command

As Shrek's coach, Yu Xiaogang emphasizes endurance, physical conditioning, discipline, and adaptability.

• Trains the Shrek Seven Devils with sealed Soul Power and heavy stone loads to strengthen their bodies and survival instincts. 92
• Prefers defensive planning when facing opponents whose strength exceeds Shrek's. 68
• Discourages Tang San's independent use of Hidden Weapons during team practice, viewing it as a departure from assigned tactics. 2
• Provides limited opponent intelligence before the Promotion Tournament, arguing that enemies' trump cards cannot be easily investigated. 109

Equipment / Items

• Twenty-Four Moonlit Bridges Night — a black belt inlaid with twenty-four jade stones. Yu Xiaogang gives it to Black Tang San as a welcome gift and later formally entrusts it to him after their first soul hunt. 6 12
• Soul Hunting Forest token — used to gain entry to the Soul Hunting Forest with Tang San. 9 10
• Training vine — used while supervising the Shrek Seven Devils' physical training. 92

Relationships

• Tang San (Black World) — His personal disciple, whom Yu Xiaogang accepts after identifying his Twin Martial Souls. Tang San initially reveres him as both teacher and father, but gradually loses faith in his guidance. 5 6 43 101
• Bai Tang San (White World) — A hostile critic who refuses Yu Xiaogang's tutelage, exposes flaws in his logic, and later disproves many of his limits through practical achievements. Yu Xiaogang attempts to claim Bai Tang San as a spiritual successor and take credit for his work. 5 18 39
• Flender — Longtime friend and Shrek Academy's dean. Flender initially supports Yu Xiaogang but increasingly refuses to validate his claims as his behavior worsens. 35 39 101
• Liu Erlong — A woman with whom Yu Xiaogang shared a past emotional relationship. She rescues him from a carriage accident but later reveals that she has returned to her family and moved on. 82 83
• Yu Tianheng — His nephew and a member of the Blue Lightning Tyrant Dragon family. Yu Tianheng politely rejects Yu Xiaogang's unsolicited instruction, deepening Yu Xiaogang's humiliation. 69 70
• Shrek Seven Devils — His students and training subjects. Their growing awareness of the disparity between their resources and the White World's power causes several of them to question his teachings. 2 92 101
• Bibi Dong — An acquaintance from his past whom Yu Xiaogang approaches in Spirit City for information on Twin Martial Souls. She rejects his appeal and condemns his use of their past relationship as leverage. 118 124

Story Role / Major Arcs

Nuoding Academy and Tang San's Apprenticeship

Yu Xiaogang discovers Black Tang San's Twin Martial Souls and accepts him as a disciple. Tang San's need for belonging makes him immediately accept Yu Xiaogang as a father figure and devote himself to carrying on his teacher's theories. 5 6

In the White World, Bai Tang San rejects Yu Xiaogang's attempted recruitment. He criticizes the Master's deduction as incomplete and questions Yu Xiaogang's right to teach others while remaining stuck at level 29. Bai Tang San instead offers theoretical data in exchange for access to Yu Xiaogang's knowledge. 5 6

First Soul Hunt

Yu Xiaogang brings Black Tang San into the Soul Hunting Forest, relying on Luo San Pao's senses and radishes as preparation. When a four-hundred-year Datura Snake defeats Luo San Pao, Tang San must protect Yu Xiaogang and fight for their survival. 8 9 10

After the expedition, Yu Xiaogang gives Tang San the Twenty-Four Moonlit Bridges Night belt, strengthening Tang San's loyalty despite the failed hunt. 12

Public Challenges to His Theory

Bai Tang San publicly challenges Yu Xiaogang's statement that no Martial Soul is useless. He proposes that Martial Soul strength depends on both base quality and development depth, then uses the disparity between Blue Silver Grass and elite Martial Souls to refute Yu Xiaogang's claim. 18

Unable to accept the defeat, Yu Xiaogang later declares that Bai Tang San's accomplishments are extensions of his own theories. The resulting backlash leads Martial Soul Hall to publicly discredit him and remove his works from its library. 39

Shrek Academy Coach

Yu Xiaogang serves as the Shrek Seven Devils' instructor, enforcing harsh physical training and attempting to shape Black Tang San into a pure control-system Soul Master. His rigid limits, lack of practical preparation, and distrust of resource-based advancement increasingly strain his authority. 46 68 92 101

Following the Promotion Tournament, he leaves for Spirit City to seek the Pope's help with Tang San's Twin Martial Soul backlash. Bai Tang San had already solved the issue months earlier, making Yu Xiaogang's journey futile. 118 119

Final Collapse

As industrial weapons, medicinal resources, intelligence networks, and Bai Tang San's strategies repeatedly prove more decisive than his theories, Yu Xiaogang's confidence deteriorates into despair. 101 122

The Black World's destruction of the Blue Lightning Tyrant Dragon Sect completes his breakdown. Witnessing the White World repel Spirit Hall through traps, heavy repeating crossbows, enhanced physiques, and intelligence, Yu Xiaogang concludes that his lifelong work could not protect his own family. 148

By the following chapter, he suffers a complete mental collapse, alternating between laughter, tears, and incoherent demands to manufacture repeating crossbows. 149

Notable Quotes

“There are no useless Martial Souls, only useless Soul Masters.” 6 18

“Only my theory can turn decay into magic.” 2

“The fourth Soul Ring absolutely cannot exceed five thousand years. This is an ironclad rule.” 82

“Theory! I am Master! The greatest theoretical master under heaven!” 149