Career
Busan IPark
Ju made his league debut for Busan IPark as a substitute in 6-0 defeat away to Football Club Seoul on July 21, 2012. His first full start came almost two years later in a league match against Gyeongnam on May 4, 2014. His first league goal came a month later in a 4-2 victory over Seongnam Football Club. Ju became a regular starter and key player for IPark in the second half of the 2014 K League Classic season.
He finished the season with five assists, the most at the club, and was named in the weekly K League Classic "Best Eleven" on three occasions.
Ju continued to be a regular starter in the 2015 season, as IPark were relegated into the K League Challenge. Football Club Seul
Ju joined Football Club Seoul on 8 January 2016.
Ju made his debut for the Korean national team on 11 June 2015, appearing as a substitute in a 3-0 victory over United Arab Emirates. He was later selected in the squad for the East Asian Cup.