College

Kim played college basketball for Chung-Ang University, where he was teammates with future KBL MVP Oh Se-keun and roommates with Lee Dae-sung. During his senior year, he was named the U League regular season MVP.^[3][4]

Professional

Kim was drafted by Seoul SK Knights second at the 2011 KBL rookie draft, behind Oh.^[5] He quickly established himself, averaging 14.94 points, 3.5 assists in his debut season.

During the 2012-13 season, Kim established himself as a mainstay of the Knights team which won the regular season title. He won MVP of the Month (later changed to MVP of the Round) three times and was also voted KBL Most Valuable Player, averaging 12.08 points, 4.9 assists and 2.9 rebounds.^[6][7][8]

In October 2015, the KBL announced the police investigations into over a dozen players and their involvement in an illegal gambling site. Kim, Oh and several other fellow Chung-Ang University alumni were found to have been involved while they were still college students, before turning professional. All were sentenced to 120 hours of community service, fined 5% of their annual salary and suspended for 20 games. However, Kim only served the suspension as he had reported the gambling activities to the KBL before the official investigation and had not been involved in any illegal gambling since turning professional.^[9][10]

Two games into the 2017-18 season, Kim injured his ankle and was out for twelve weeks as it required surgery.^[11][12] After returning from injury, he was mostly a substitute and played only nine games in the regular season but played a vital role during the play-offs, especially during the finals against regular season champions Wonju DB Promy. Seoul SK Knights won their first championship title in twelve years and it was Kim's first of his career.^[13]

The defending champions went into the 2018-19 season struggling with injuries to key players. Prior to the January game against Busan KT Sonicboom, they had been on a 10-game losing streak before Kim scored a career-high 49 points as the Knights came from behind to narrowly win 91-90 in overtime.^[14][15] With the record, he is tied for third place for the most number of points scored by a domestic player in a single game in KBL history.^[16]

National team

Kim participated at the 2014 FIBA Basketball World Cup.^[17] He was a member of the gold medal-winning team at the 2014 Asian Games, which meant that he was exempted from mandatory military service.^[18]