Roh Ji-hoon was born on July 12, 1990, in Incheon, South Korea, he is the younger sibling in his family and has two older sisters, and he graduated from Seoul Physical Education High school.

Before Roh Ji-hoon joined MBC's "Birth of a Great Star, he had trained and released an OST song for drama "Can Anyone Love" back in 2009 under UFO Entertainment.

[10] On September 16, 2015, Roh Ji Hoon made a comeback with his 2nd Mini Album, "Feeling" or "感 (감)".

The self-composed 4th track, "9월 7일" or “September 7”, was written for his close friend, RiSe of Ladies' Code, who was on "Birth of the Great Star" with him and died on that date.

[12] In April 2018, Roh Ji-hoon announced his engagement to racing model Lee Eun-hye, after dating her for 3 months, and her becoming pregnant.