Muki (Jeong Eun-sil, 정 은실) and Mansu (Lee Min-hwi, 이 민휘), who were classmates from the Korean National University of Arts. Mansu played the guitar, and Muki played a modified version of a traditional Korean drum called a Janggu. They studio album was nominated as Rookies of the Year at the 2013 Korean Music Awards. (dixit Wikipedia)