Park Ye-eun, professionally known as Yeeun, Yenny, or Ha:tfelt, is a South Korean singer, songwriter and composer known for her work as a former member of South Korean girl group Wonder Girls. In July 2014, she made her debut as solo artist under the name Ha:tfelt with released her solo EP Me?. In early 2017, Wonder Girls officially disbanded due to contract expiration. Following the disbandment, Yeeun signed with Amoeba Culture to continue her career as solo artist.

Goyang is a city in Gyeonggi Province in the north of South Korea. It is part of the Seoul Capital Area, making Goyang one of Seoul's satellite cities. It is one of the largest cities in the Seoul Capital Area, with a population of just over 1 million. Ilsan, a planned city, is located in the Ilsandong-gu and Ilsanseo-gu districts of Goyang. It also includes Deogyang-gu which is closer to Seoul.