He is an Underground companion of [Levi](https://anilist.co/character/45627/Levi), [Furlan Church](https://anilist.co/character/87928/Furlan-Church), and [Isabel Magnolia](https://anilist.co/character/87929/Isabel-Magnolia). He is known to be a calm and considerate person to other people living in the Underground city. Yan is one of the underground companions who gets paid by Furlan Church. Since Furlan knows well that Yan needs more money for his leg treatments, he gives Yan more money than usual.
