Mr. Simple is title song from Super Junior (슈퍼주니어) 5th album.
The song genre is a ‘SJ FUNKY’, genre created for Super Junior only. And it can be considered as the final version of ‘SJ FUNKY’ following ‘SORRY, SORRY’ and ‘BONAMANA’.
The lyric describes the reality where modern people living in a complicated world failing to achieve what they intended to and losing their love and dreams without the breadth of mind in a simple way with humorous and metaphorical words, meaning “There is no need to take everything very serious. Simple and easy way can rather be a better choice for finding oneself” like the title, ‘Mr. Simple.’ Lyrics, composed & Arranged by YOO, YOUNG JIN