Kim Ha-seong started as a second baseman in the 2021 Major League Baseball game against the Colorado Rockies at Coors Field in Denver, Colorado, USA on the 17th and recorded one hit in three at-bats.Kim Ha-seong's batting average for the season was 0.211.

Kim Ha-seong, who started again three days after the New York Mets match on the 14th, was able to get to base by hitting a hit in the second inning with no runners in the second inning, who fell 0-3. However, he did not score a goal due to a mismatch in the follow-up.

After that, he was silent in the second at-bat. Kim Ha-seong, who retreated to third baseman with a ground ball in the second at-bat he faced in a 2-3 first base situation in the third inning,which was tied at 3-3, bowed his head with a wasted swing strikeout in the fifth inning without a runner.

Afterwards, Kim Ha-seong was substituted in the 5th inning defense. The San Diego pitcher was replaced by Nabil Crismatt and kim Ha-Seong was replaced by Jake Cronenworth as second baseman.San Diego, who played consistently against Colorado, suffered a final defeat.

In the early ninth,he drew a score from a full-base chance and tied the score 7-7, but he allowed Trevor Story to walk and steal bases in the bottom of the ninth, and lost 7-8 with a walk-off hit to pinch hitter Charlie Blackmon. The loss put San Diego on a three-game losing streak.