Yoon Shi Yoon is a South Korean actor and television personality managed by MOA Entertainment. He was born in Suncheon, South Korea. He debuted in the daily sitcom "High Kick Through the Roof".

He appeared in a commercial for the cellphone Bubi Bubi with the famous girl group T-ara. He also sang 4 singles for the soundtrack of the commercial.

On April 28, 2014, Yoon secretly enlisted in the Republic of Korea Marine Corps and was discharged on January 27, 2016.

In May 2016, he became a regular cast member of the third season of the variety show "2 Days & 1 Night".

In 2019, he did voice acting for the animated movies "Paboos" and"Bakugan: Battle Force".

He is an avid lover of books. It is stated that he possesses over 2,000 books at home.

On February 24, 2025, he signed an exclusive contract with the new agency R&C Entertainment.