Bai Yu

Biodata

Feature	Value
Name	Bai Yu (白钰) 19
Alias(es)	Sis Yu, used by Bai Xuan 150
Species/Race	Human 19
Gender	Female 19
Age	23 19
Affiliation	Ninghang City Public Security Bureau; later the White Sea City Investigation Bureau 10 63
Occupation/Role	Police officer; later Investigator 19 63
First Appearance	Chapter 1 1

Power Progression

Stage / Realm / Level	Chapter	Notes
F level	19	Her World Book readout lists E+ Strength, Agility, and Constitution, D Spirit, and no abilities. Bai Xuan secretly injects her with a Gene Enhancer 19.
Enhanced physical condition	23	Tests at the military base show every physical reading more than 50% above her previous results. Bai Yu does not know what caused the change 23.
Elastic Body ability	31 40	Bai Xuan adds the Elastic Body profile to her. She later demonstrates it by stretching and coiling her body around him 31 40.

Background and History

Bai Yu and Bai Xuan grew up as orphans and are not related by blood. She supports their household while serving as a police officer, although she says that Bai Xuan was the one who protected her when they were children 1 19 109. Her work brings her into investigations of disappearances, illegal experiments, and attacks on the Public Security Bureau 6 10.

Worried that she cannot always defend herself, Bai Xuan secretly gives her a Gene Enhancer and later the Elastic Body profile 19 31. As her physical abilities grow, the Ninghang Investigation Bureau offers to test her for a hidden ability and considers her for an Investigation Assistant post 30 48. She instead accepts an offer to become a full Investigator with the White Sea City bureau 62 63.

Bai Yu initially believes Bai Xuan is an ordinary student. After discovering his connection to the Slime-Masked group, she worries that its secrecy leaves him without the protection of an official bureau 109 154. She later realizes that Bai Xuan himself wore the mask and sees him take a leading combat role in the operation against the Dreadbone Rakshasa 158 173 174.

Appearance

Bai Yu is described as a black-haired woman 4.

• Her enhanced hearing lets her detect a faint voice from inside Bai Xuan’s room 54.

Personality

Bai Yu takes her duties seriously, even when the work distresses her. The discovery of bodies used in illegal experiments leaves her shaken, but she shields Bai Xuan from most of the details 6. During the Tyrant’s attack, she acts on her suspicion that a prisoner was captured too easily and contacts the Investigation Bureau when the threat emerges 10.

She is protective of Bai Xuan without wanting him confined to a quiet life herself. She rejects a proposed bureau position for him because she believes he is an ordinary person, and she weighs her own career opportunities against the time they would leave her at home 42 109. Once she learns more about his companions, she tells him that their reliability puts her mind at ease 155.

Abilities and Skills

Investigation and perception

Bai Yu’s Police Officer identity is associated with keen investigative and perceptive abilities 19.

• She suspects that the man who becomes the Tyrant allowed himself to be arrested 10.
• She locates members of the Evil Organization during the Ice Curse Dragon operation 87.
• Her enhanced senses allow her to hear a faint voice through Bai Xuan’s door 54.

Enhanced physique and Elastic Body

Bai Yu’s physical test results rise sharply after Bai Xuan secretly enhances her; she does not initially know why 19 23.

• Elastic Body allows stretching, compression, expansion, and other changes of shape 31.
• She demonstrates the ability by making her body supple enough to coil around Bai Xuan 40.
• Against the rapidly regenerating Spade Four, she takes a grenade launcher and uses it when ordinary gunfire proves ineffective 50.

Ghostly Flame

Liu Mufei teaches Bai Yu to use the Ghostly Flame during the operation against the Dreadbone Rakshasa 173.

• Its Ghost Spirit Form turns her into a flame-like spirit capable of using sealing arts against a Ghost God 173.
• Following Liu’s method, she forms a spectral-fire hexagram to seal and purify a suffering woman’s soul 175.

Equipment and Items

• White-rose badge — received when she joins the White Sea City Investigation Bureau 63.
• Grenade launcher — used against Spade Four’s regeneration 50.
• Ghostly Flame — retrieved from the Investigation Bureau warehouse for Liu Mufei’s operation; Bai Yu learns to activate its Ghost Spirit Form 172 173.
• White-Blood Magatama — given to her by the soul she purifies; she passes it to Bai Xuan to examine 175.

Relationships

• Bai Xuan — her younger, non-blood-related brother. They grew up relying on each other, and each tries to protect the other, often while keeping dangerous work secret 1 109 154.
• Liu Qian — her friend and fellow officer. Bai Yu checks on her at the Safe House and worries when she is suddenly taken to White Sea City 19 30.
• Li Hongyou — an Investigator who works alongside Bai Yu, including during the Ice Curse Dragon operation, and helps arrange her move to White Sea City 62 87.
• Liu Mufei — the deputy director who recruits Bai Yu. Bai Yu later cooperates with Liu’s impersonation plan and considers her invitation to join a separate group 63 109 158.
• Luo Miaoyin — a powerful ally Bai Yu encounters during the Ice Curse Dragon operation. Luo says she knows Bai Yu, though Bai Yu cannot remember meeting her 88 155.

Story Role and Major Arcs

• Ninghang investigations — Bai Yu investigates the disappearances linked to illegal experiments and survives the attack on her Public Security Bureau branch 6 10.
• Recruitment to White Sea City — her improved abilities draw interest from investigators; she accepts a full Investigator position rather than Ninghang’s proposed assistant role 30 48 63.
• Ice Curse Dragon aftermath — after joining the bureau’s operations, she agrees to let Liu Mufei impersonate her as bait while threatened Investigators lie low 81 109.
• Bai Xuan’s identity — she uncovers his connection to the Slime-Masked group, then realizes that he was the masked figure himself 154 158.
• Ghost God operation — she uses Ghost Spirit Form during the Dreadbone Rakshasa mission and purifies the soul trapped in its Ghost God Orb 173 175.