American actor Young Mazino was born in Maryland to immigrant Korean parents. Under their guidance, Mazino, who is classically trained, pursued his interest in music and acting, participating in film and theater productions throughout his childhood and college years. He got his acting debut in the short "Digging" (2013). The following year, he dropped out of the University of Maryland to attend the Stella Adler Studio of Acting, pursuing a full-time career in the business.
He performed live theater in New York in the off-Broadway production of "Comfort Woman" (2017) and joined the Screen Actors Guild in 2018. He played roles in several short films and television shows before being cast in the hit series "Beef" (Netflix, 2023), for which he was nominated for an Emmy award. In the same year, he landed a role as the star of the Sundance-supported dramedy series "Good boy" (Youtube, 2023).