Longguo & Shihyun (Korean: 용국 & 시현) is a South Korean duo formed by Choon Entertainment in Seoul, South Korea.[1] The duo previously participated in Produce 101 Season 2. They debuted on July 31, 2017, with the single "the.the.the".[2] Longguo was a member of fan-made project boy group JBJ, having signed a seven-month contract with the label Fave Entertainment.[3]