Choi Sihyuk

 (최시혁) is a former member of NIK and also a former member of the Korean group Apeace.

On March 26, 2021, it was announced that his company and NIK's management didn't come to an agreement regarding his promotions, and as a result he would stop his activities as a NIK member.

On September 29, 2021, CONTAINER,Inc (Apeace's Japanese agency) announced that Apeace will be disbanding in the end of December.

Profile

 * G-EGG Final Ranking: #6
 * Before joining Apeace, he was a member of a dance duo called Street Jam.
 * He joined Apeace on April 9, 2014, replacing Lee Myung-eun, a former member of the group who was fired for breaking a clause that prohibited members from having romantic relationships (he married in secret in South Korea, which was prohibited and what led to his expulsion from Apeace).
 * In addition to being part of the main group (Apeace), he became a member of three different sub-units: ONYX, LAPIS5 and FLOWERS.
 * He has the same name as Choi Si-hyuk (Former Produce X 101 contestant).
 * His favorite dish is samgyeopsal/삼겹살구이 or Korean grilled pork belly (a popular Korean dish consisting of grilled pork belly accompanied by vegetables like lettuce and perilla leaves, kimchi and dipping sauces like ssamjang).
 * According to Choi Young-won (Apeace's leader and main vocalist), Sihyuk is considered Apeace's mascot.
 * He is known for his duality: he raps with a deep voice despite his baby face.
 * He and Kim Jinwoo are the rappers of Apeace (that is, they are responsible for the rap in the group).
 * In Veil (Apeace's song released in 2014), he took over the lines that were originally from Myungeun (the fired Apeace member that Sihyuk replaced).
 * He is one of the shortest members of Apeace, along with Choi Young-won and Kim Won-sik (all three are 6 feet 6 inches tall).
 * On G-EGG, he was part of Team-A, along with JUNON SUPERBOY ANOTHERS TEAM YOUTH's Yonemaru Hinata, CIYST's JONG, LUCENTE's Ko Gun and Code-V's Taehoon.