Sieun, CHECKMATE Wiki

Sieun (시은) is a South Korean singer currently under GRACE COMPANY Entertainment. She is the former leader of the co-ed group CHECKMATE and a former member of the girl group Ramisu and pre-debut group Rendezvous. Missing required parameter 1=month! Instagram

CHECKMATE, Wiki

Who are the oldest rookie K-pop idols in 2020? - Quora

CHECKMATE, Wiki

FAP

Sieun (R3PLAY), Kpop Wiki

CHECKMATE members kpop profile (2023 updated)

Sieun (R3PLAY), Kpop Wiki

Yongseok, CHECKMATE Wiki

Sieun (R3PLAY), Kpop Wiki

CHECKMATE Members Profile (Updated!) - Kpop Profiles