On the 5th of December, rookie girl group PRISM announced their fandom name to be Praha (프라하)! The name is short for Prism's lighthouse (프리즘 라이트 하우스) and means the fans are the the group's guiding light.

PRISM made their debut on the 24th of May with the single Chok. The group consists of the four members Terra, Vanhye, Produce 101 contestant and former 101 and Blady member Ryeowon (Ham Yeji), and the older sister of 100%'s main vocal Hyunsik Yoonseol.