U-Si 유시 is the maknae and main vocal of Badkiz.
U-Si was born Yoon Jiyeon 윤지연 on Thursday, November 13, 1997. The age gap between her and the oldest member, Duna, is 6 years, 8 months, and 24 days.
She and her fellow member, K.Me, were both born in November, 3 days apart in different years. They're both Scorpios.
U-Si was born in the Chinese Year of the Ox. She's 170 cm or 5'7" tall and her blood type is B.
She's from Iksan, North Jeolla Province. K.Me is from Jeollanam-do, too.