 Yoon appeared in his first major film role in 2012's "Tone-deaf Clinic" (released internationally as "Love Clinique"), playing a vocal coach who gives a tone-deaf woman voice lessons so that she can sing well in front of her crush.In 2013, he returned to the small screen with the popular series "I Can Hear Your Voice", playing a well-meaning but bumbling cop-turned-public defender.He later reunited with the director of "I Can Hear Your Voice" in the 2014 cable drama "Gap-dong", in which he played a detective out to capture a serial killer and clear his father's name.