|Age||Mid 30s (presumed)|
|Affiliation||Murim, Martial Arts Alliance|
|Previous Occupation||Shi-Woon's Bodyguard|
|Fighting Style||Artists' Society Martial Arts|
|Manhwa Debut||Chapter 41 (The Breaker)|
Yu Sa-Ah is a member of the Martial Arts Alliance Protectors Group. She is often seen near the scenes of notable events, relaying information to the Alliance Elders. She was briefly assigned to Shi-Woon Yi as his undercover bodyguard during the period in which the Martial Arts Alliance was in the process of making a decision regarding Shi-Woon's future (he was to remain untouched until the decision was passed) after the Koa Tower Incident.
Yu Sa-Ah is a woman whose trademark appearance lies in her round eyeglasses and a beauty mark on the lower-left side of her face. She is normally seen in a business jacket and skirt with her hair down, but donned the attire of a nurse while undercover.
She is mostly business-oriented but does seem to, more than her co-workers, enjoy the more interesting events that her job entails such as Goomoonryong's challenge to the Alliance. She also seems to consider her marriage-able status to be an important and sensitive issue, as she stomped a member of the Iron Fist School into the ground while angrily ranting because she was called an "Old Hag".
Death Fight...!! A firm commitment for someone special!Edit
Techniques & AbilitiesEdit
Expert Martial Artist (Artists' Society Style): Yu Sa-Ah can be presumed to be a high level fighter given her rank within the Martial Arts Alliance. She is also seen easily defeating a member of the Iron Fist School.
- Ki-Whirlwind Technique: Uses the opponent's external force to send the opponent flying.