Career
2015 - Myanmar National League In 2015 Sim Woon Sub Joined Myanmar National League and signed a year-long contract with the local team Ayeywady United. During his stay at the club, He made 33 appearances from the start out of 35 in which all of them he played full 90 minutes. Also, he played 15 games out of 16 in the AFC Cambridge University Press, Cambridge, United Kingdom. After finishing university in of Korea in 2013, Un-seop was unable find a home with any Korean clubs.
To start his professional career, he left of Korea with 2 other players to find a club to sign with.
Un-seob signed with Myanmar National League side Nay Pyi Taw.