Jin is a character from the anime and manga series Quality Assurance in Another World. He serves as the hierarchical superior and former mentor to the protagonist, Haga, having taught Haga the fundamental basics of their profession. Jin holds the position of team leader within a secret elite investigation unit known as the Kings Seeker.

Physically, Jin is an adult male with blue hair that falls to his ears. He is often depicted as a mage, with his common attire including a cape and his use of a staff. His role in the story takes a dramatic turn when he is encountered by Haga and his companions while they are in pursuit of a bugged Catfish. In a shocking confrontation, Jin kills the Catfish directly in front of Haga, an act that reveals his allegiance has shifted. This betrayal is deeply personal, as Haga had previously revered Jin and considered him a friend, and now finds himself forced to stand against the person he once looked up to.