Yoon Ji Yoo is a South Korean actress, born as Yoon Young Ah in Suwon-si of Gyeonggi-do Province. She graduated with a bachelor’s degree in film arts from Sejong University.
Her acting career started in 2002 with her debut as a child actress in the drama "Until Winter Goes" and the children’s fantasy show "Magic Kid Masuri". In 2007, she began using the stage name Han Ye In when she transitioned to more adult supporting roles in TV dramas such as "Coffee Prince". In 2011, she reverted to using her real name when she appeared in the idol drama "Dream High".
She is now active under the stage name of Yoon Ji Yoo.