Yu Jing

Biodata

Feature	Details
Name	Yu Jing (俞婧)
Alias(es)	Student Yu 1
Species/Race	Human 1
Gender	Female 1
Age	22 12
Height	1.67 m 3
Affiliation	Su Huan's Armed Train engineering team 11 43
Occupation/Role	Mechanical and Electronic Engineering graduate student; mechanic, designer, and materials researcher for the Armed Train 1 11 37
Family	Yu Yue (mother) 1
Status	Active 50
First Appearance	Chapter 1: “Conductor's Log” 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Evolutionist — Lv1 Pan-Energy Erosion	37	Awakened Pan-Energy Erosion and used it to fuse Night Demon claws into steel, producing a lighter and tougher composite plate approaching Tier 1 Light Armor quality.

Background

Yu Jing was a combined bachelor-master student in Mechanical and Electronic Engineering when the apocalypse began. Her father was a railway engineer, giving her a practical connection to railway maintenance and modification work. When Su Huan screened candidates for the locomotive, she offered her technical skill and physical fitness in exchange for a place aboard; she successfully negotiated for her mother, Yu Yue, to be admitted alongside her. 1

Su Huan quickly tested her value by making her restore his dismantled Kawasaki Ninja H2 motorcycle. Yu Jing immediately identified the model and its specifications, then recovered roughly three to four tenths of the scattered parts during her first night of work. 3

She became one of the core technical personnel behind the Armed Train project, contributing to its armor, storage, water, and materials-development systems. 4 11 13 22 43

Appearance

Yu Jing is a 1.67-meter-tall young woman usually depicted in practical clothing suited to manual work. She initially wears a grey fitted T-shirt with dark-blue jeans, and later commonly ties her long hair into a high ponytail or bun while working. 1 3 4

• Dark, spirited phoenix eyes, often noted for their focused or inquisitive expression. 4 9 23
• Frequently gets grease, dirt, or construction grime on her clothing while repairing equipment or modifying the train. 3 15
• Carries a pencil in her hair while drafting technical plans. 22

Personality

Yu Jing is calm, incisive, and highly self-assured in technical matters. During her initial interview, she clearly states her qualifications and immediately bargains for her mother's safety; after witnessing Su Huan kill a disruptive passenger, her expression remains unchanged. 1

Her reserved demeanor changes around machinery. She becomes notably animated, talkative, and enthusiastic when handling mechanical tools, recognizing useful equipment, or discussing engineering solutions. 3 13 She approaches problems with professional rigor, supporting her proposed train modifications with calculations rather than broad ideas. 11

She also has a pronounced researcher's curiosity. Yu Jing studies Su Huan's knowledge of evolution with a probing gaze and requests dangerous Tier 1 biological material for examination despite being warned that it is infectious. 9 23

Abilities & Skills

Mechanical Engineering and Repair

Yu Jing possesses advanced hands-on mechanical ability, comparable in Su Huan's assessment to a veteran mechanic despite her status as a graduate student. 3

• Identified the Kawasaki Ninja H2 immediately and began restoring its dismantled components. 3
• Suggested replacing simple frontal armor with a plow-shaped cowcatcher to better clear zombies and track obstacles. 4
• Recognizes professional-grade tools and efficiently organizes them for construction work. 13
• Designed modular water tanks and a water-pipe layout for the train's forward carriages. 22 43

Armed Train Design

Yu Jing is responsible for much of the Armed Train's structural planning and modification work. 11

• Proposed 1.2 cm reinforcement plates for the vulnerable carriage walls, with an internal honeycomb buffer layer. 11
• Recommended sealing unneeded windows, reinforcing necessary ones with blast-proof mesh and internal steel plates, and preventing interior light leakage. 11
• Designed a roof-connected combat platform beginning at the sightseeing carriage. 11
• Calculated that the first-stage armor plan required approximately 3,000 standard steel plates. 11
• Directed the conversion of Carriage 6 into a storage carriage, including shelving layout, compartment placement, and window sealing. 13

Pan-Energy Erosion

After evolving, Yu Jing gained Lv1 Pan-Energy Erosion, allowing her to alter and combine materials. 37

• Fused Night Demon claws into steel to create a plate 52% lighter than ordinary steel while significantly improving its strength and toughness. 37
• Produced a material assessed by Su Huan as approaching Tier 1 Light Armor quality. 37
• Her current output is limited by Pan-Energy and production time: a one-square-meter sheet requires about half a day. 37
• The resulting material is difficult for Qi Xiaoba to manipulate, consuming four to five times the Pan-Energy required for ordinary metal. 38

Equipment & Workspaces

• Mechanical hand tools, including wrenches, drills, welding equipment, and salvaged repair tools. 3 13
• Drafting materials, including blueprints, calculations, a notebook, and a pencil kept in her hair. 11 22 43
• A dedicated workshop established in a luggage carriage after the Armed Train incorporates carriages from the Hydrogen Train. 43
• Night Demon claws and other recovered evolved-zombie materials used in composite-material experiments. 23 37

Relationships

• Su Huan — Recruits Yu Jing for her engineering value and accepts Yu Yue as part of Yu Jing's condition. He relies heavily on her modification plans and materials research; their professional cooperation is complicated by recurring personal tension. 1 11 21 37
• Yu Yue — Her mother. Yu Jing insists that Yu Yue be admitted with her, and later helps assess how Yu Yue's Sonic Affinity could support the team as a long-range combatant. 1 28
• Qi Xiaoba — Technical collaborator whose Metal Control complements Yu Jing's plans; she directs his metalworking during storage-carriage and water-tank construction. 13 22
• Liang Kuan — Fellow core crew member who works alongside her on train armor and follows her maintenance assessments. 4 19
• Wan Xing — Provides evolved-zombie materials for Yu Jing's research, including the Tier 1 Defender-serum component and Night Demon claws. 23 37

Story Role

Recruitment and Early Repairs

Yu Jing joins Su Huan's locomotive group with Yu Yue after presenting her engineering credentials. Her successful work on the Kawasaki motorcycle establishes her as a key maintenance specialist early in the journey. 1 3

First-Stage Armed Train Project

She designs the preliminary all-carriage reinforcement plan, covering armor thickness, window protection, roof defenses, and a rooftop combat platform. She also contributes practical improvements such as the cowcatcher concept and anti-climbing steel bars. 4 11

Internal Infrastructure Development

Yu Jing helps transform Carriage 6 into a food-storage carriage, organizes shelving and construction work, and later develops integrated water- and fuel-tank plans for the train. 13 22

Materials Research and Evolution

After receiving infectious Tier 1 material from Wan Xing's Night Demon decomposition, Yu Jing pursues materials research. She later evolves to Lv1 Pan-Energy Erosion and produces a lightweight, high-strength steel composite approaching Tier 1 Light Armor. 23 37

Hydrogen Train Expansion

When Su Huan salvages eight carriages from a Hydrogen Train, Yu Jing receives a separate workshop and continues planning water-pipe installations for the reorganized front carriages. 43

Notable Quotes

“When you twist the throttle to the end, it's about the same as being kicked by God.” 3

“Spikes have too small a surface area and break easily. They have a strong visual effect, but they aren't practical against things like zombies that don't feel pain.” 11

Trivia

• Yu Jing's father is a railway engineer, a background that aligns closely with her role in modifying and maintaining the Armed Train. 1
• She recognizes the Kawasaki Ninja H2 on sight and refers to it as a “Land Flyer.” 3
• Despite her mechanical talent, Yu Jing is implied to be exceptionally poor at cooking. 38