Kim Eun-sung is a South Korean singer, host, and actor active in China. He graduated from Pakche Institute of the Arts.

He trained for two years in South Korea before debuting in boy group Top Combine in 2008. His age was ranked fifth in the group, which gave him the nickname "Xiao Wu." In the same year, he started hosting talk show "Day Day Up."

Due to being bilingual, he was sometimes hired to be the translator/agent of South Korean celebrities working in China. This includes boy groups TimeZ, UNIQ, and singer The One.

On February 10, 2022, he married actress Zhang Meng.