Woo Ji Yun (우지윤; or simply Ji Yun) is a South Korean rapper and singer. She was one half of the duo BOL4. As a soloist, she goes by the name name Odd Child (낯선아이). On April 2, 2020, Shofar has announced that Ji Yun has departed from BOL4. She released her first musical release since her departure from BOL4 on June 18, 2020.