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).
 * He is responsible for ASMR videos on the official Apeace YouTube channel.
 * His favorite pastime is making fun of Ji Hyun-sung, one of the main vocalists of Apeace (mainly because Hyunsung is one of the tallest members of the group and because he is very skinny, which makes him the target of Sihyuk's jokes).
 * 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.