Kim Jong-Kook

Nickname            : The Commander

                            : The Tiger

                            : Mr. Capable

                            : Sparta Kook

                            : Kookie

                            : The One Man

                            : Coach Kook

Birthday               : April 25, 1976 (age 39 as of 2015)

Birthplace            : Hapcheon, South Korea

Nationality          : South Korean

Years Active       : 1995-present

Occupation         : Singer, dancer, entertainer, television personality

Kim Jong-Kook is a South Korean singer and TV personality. He was initially part of the Korean duo Turbo, however he later pursued a successful career as a solo artist. He was an active participant in variety shows such as X-man and Family Outing. Currently, he is a cast member of Running Man. He is also hosting a documentary program called Escape Crisis No. 1.

Kim Jong-kook first entered the Korean music industry in 1995 as a member of the duo, Turbo, which became immensely popular for their catchy music. After the duo disbanded a few years later, he became a solo singer in 2001, mostly concentrating on ballads. Although his unusually high tone of voice is often joked about (with many stars jokingly calling it a "mosquito voice"), he had many hit singles and has also been a frequent guest on many variety shows, most notably X-man. In addition, his muscular body is often considered one of the best in K-pop.

He is the strongest man in Running Man and is known for his strength and skill during missions, earning him the nickname "Tiger". During name-tag ripping, he is known for his sudden appearances that are often accompanied by the soundbite “This is Sparta!” taken from the movie, 300. He is known for having both brains and muscles. His only apparent weakness is women and is often teased for having a particular fondness towards Yoon Eun-hye, gaining him the nickname “The One Man”. He is known to like to coach others during missions, which is why the other members nicknamed him "Coach Kook".

Source : Wikipedia