[9] Yoo played a character of a 'bokhaksaeng' (returning student, usually after mandatory military service or other hardships, that could not keep up with the trends with his peers) in 2005 in the popular comedy segment called 'Bongsungahakdang', then known with the catch phrase "Colour Power!

In later works, they created parodies including "Itaewon Freedom" featuring CEO of JYP Entertainment/musician Park Jin-young, and "Who am I" based on The Beatles.

This release marked the return of Yoo to the entertainment industry after voluntarily surrendering to police for driving under the influence in May 2013.

[17] UV performed on and had writing credits for several songs on the 'Original Motion Picture Soundtrack' of 2014 Korean movie 플랜맨 (The Plan Man).

[18] Occasionally, Yoo releases musical parodies on various aspects of pop culture such as his second EP titled "Kkattalk" which makes fun of the South Korean instant messaging service KakaoTalk.