Yuki (유키) is a South Korean idol born in Bupyeong-gu (부평구), Incheon. She is a member of the girl group SATURDAY (세러데이), debuting on July 18, 2018. She studied at Hallim Arts High School (한림연예예술고등학교) in the practical music department, and as of 2026 is enrolled at Inha Technical College (인하공업전문대학) studying aviation operations — seemingly preparing to become a flight attendant. She is 161cm tall, blood type O, and an ENFP.

Her positions in SATURDAY are main dancer and lead vocalist. She started dancing at age 7, competed in dance competitions throughout elementary school, and is particularly known for her belly dancing which she performs in the dorm to liven up the atmosphere. She has a distinctive vocal tone and is described as the "tone fairy" of the group. She also served as MC on the EBS show Saengbansong Bangkwahou Dundun (생방송 방과후 듄듄) in 2021 under her real name Jiyeon.

Personality-wise she's the loudest and most talkative member by far — a fellow member literally listed "way too noisy" as her flaw. She's the social butterfly of the group, forms a comedy duo with member Ayeon, and is known for an almost supernatural sense of smell earning her the nickname "Koki Yuki." She's also the best English speaker in the group despite the members thinking her exotic looks and Japanese-sounding name make her look Japanese — she's fully Korean.

Food-wise she's legendary within the group — once ate 8 servings of gopchang (곱창) plus 2 servings of fried rice in one sitting, occasionally eats 5 bowls of rice, and the members unanimously rank her first in eating ability. She eats everything except beans. Her attachment stuffed animal is named Lucifer, whose exact location in the dorm she can never find. She also sleeps with her eyes open, which understandably freaks out her roommates.