Kim In-sung is a South Korean footballer who currently plays for Pohang Steelers.

The Pohang Steelers are a South Korean professional football club based in Pohang, North Gyeongsang Province that compete in the K League 1, the top flight of South Korean football. The Steelers were founded on 1 April 1973 as POSCO FC, named after the steel company POSCO, which still owns the club today. They are one of South Korea's most successful teams, having won the K League five times and the AFC Champions League three times.