She is a former member of South Korean Girl group "Apink" which debuted in April 2011 under independent label A Cube Entertainment Apink is called the “post-Girls Generation” group.
She left the group and the entertainment industry on April 22, 2013 to concentrate on her studies. However, her father revealed that the company just notified Yookyung that she had been dropped from the group and was forced to leave.
After leaving the group, she was recruited to be part of other girl groups since if she joined, that group would be a hot issue. She felt that would affect A Pink so she declined. She enrolled in the School of Performing Arts and Media and continues to focus on her career in the fashion industry. She is the daughter of multimillionaire Hong Ha Jong, a CEO of a big manufacturing company. The company manufactures products like wire rope and hard steel wire, which are used to assemble cars and ships. It is said that the total company profits of 2010 was around $150,000,000 USD.