by 류충민(Choong Min Ryu), 정준휘(Joon Hui Chung)
Published in Sigmulbyeong yeon'gu (2016)

by 이상무(Sang Moo Lee), 정준휘(Joon Hui Chung), 류충민(Choong Min Ryu)
Published in Sigmulbyeong yeon'gu (2015)