About Choi Yu-jin (singer)
Choi Yu-jin, known mononymously as Yujin, is a South Korean singer and actress. Originally debuting in 2015 as a member of the South Korean girl group CLC, she is a member and leader of Kep1er after finishing in third place in the final episode of the survival show Girls Planet 999. She began her acting career in 2016 in a supporting role in the Naver TV web drama, Nightmare High. As a trainee, Yujin created and taught BtoB's Ilhoon the 'Gwiyomi Player' aegyo, which he would later popularise on the South Korean Idol variety show, Weekly Idol. In 2013, South Korean singer, Hari released "Gwiyomi Song" inspired by the gesture Yujin created. In 2013, Yujin collaborated with then-Cube artist and Beast member Yang Yo-seob in "Perfume" which was released on April 30 as part of Cube Entertainment's first "Voice Project".
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.