A children's mystery drama about four kid detectives solving various cases happening at school.
Kim Ji-min
Kang Ha Ra
탕준상
Lee Seo Jin
윤찬영
Lee Woo Jin
Yoo Jun
Choi Dong Yeong
Sieun
Jin Sun Mi
허정민
Choi Gi Chan
김명수
Kang Suk
엄현경
Song Soo Ji
Choi Shang
Teacher Ma
