Kawin is a teenage male possessing dark brown hair and brown eyes. He was one of many children trafficked by the Suzaku Group and its subsidiary Scarlet Company, organizations that purchased children for auction to wealthy clients. These children, including Kawin, had been either sold by their parents or abandoned, leaving them homeless and resigned to their fate.

During the "Wizard of Far East" arc, Kawin and the others were liberated when Laurent Thierry and his team dismantled the trafficking ring. As one of the older children, Kawin articulates a critical perspective during an interaction with Makoto Edamura. He highlights the systemic nature of their exploitation, arguing that individual rescues prove futile without dismantling the broader enabling network and emphasizing the children's collective resignation.

Following the rescue, Kawin is adopted by Cynthia Moore, a member of Laurent's team, concluding his depicted development within the series.