1) Dynamic Duo (다이나믹듀오) South Korean Hip-Hop duo. Members: 개코 (Gaeko) and 최자 (Choiza), who were members of the former trio CB Mass. They debuted as part of KOD in 2000, but the two later formed CB Mass along with 커빈 (Curbin). However, the group separated in 2003 because of financial troubles caused by Curbin. Later, Choiza and Gaeko announced in 2004 the group Dynamic Duo, and they are active until present.