|Date of birth||10 May 1994|
|Place of birth||South Korea|
|Height||1.74 m (5 ft 8 1⁄2 in)|
* Senior club appearances and goals counted for the domestic league only and correct as of 5 November 2016.
|Revised Romanization||I Gyuseong|
Lee made his professional debut for Busan IPark on 27th June 2015 against Jeju United. He marked his debut with an early goal, although Busan went on to lose the game 3-1. Lee went on to become a regular in the side for the remainder of the season as Busan were relegated to the K League Challenge.
Club career statistics
- As of 5 November 2016
|South Korea||League||KFA Cup||Play-offs||Total|
|2015||Busan IPark||KL Classic||18||1||0||0||2||0||20||1|
- "Korea Republic - Gyu-Seong Lee - Profile with news, career statistics and history - Soccerway". soccerway.com. Retrieved 20 June 2016.