As a senior in 2013 Kim was selected for the South Korean national team to compete in the 2013 FIBA Asia Championship. During the competition Kim served as the backup shooting guard, manning the position when starter Cho Sung-Min was not in the game. However, Kim averaged 12.7 points, 2.7 assists and 4.1 rebounds in only 19.9 minutes per game, and topped the entire tournament with 25 three-point field goals made in nine games. Although Team Korea failed to win the championship losing to the Philippines in the semifinal game, they clinched the slot for next year's FIBA World Cup defeating Chinese Taipei 75-57 in the third place game. In the semifinal game against the Philippines, Kim scored 27 points on 9-of-15 shooting overall and 5-of-11 from the three-point range. In the third-place game against Chinese Taipei, Kim led Team Korea with a game-high 21 points and shot 5-of-10 from the three-point range.