On June 4, he scored his first home run against pitcher Lee Tae-yang in the top of the eighth inning in Game 2 of Masan NC.

On July 3, Kang Jung-ho, who was out with back pain in Game 3 against the Lotte Giants at Mokdong Baseball Stadium, played as a pinch-runner.

With the score tied at 9:9 in the top of the eighth inning and Heo Do-hwan's error made it to the third base with two outs, he advanced to catch Son's hit and throw the ball to prevent a run at an important moment.

He hit a two-run shot against Park Jun-pyo, which was a 3:3 off-balance home run and a meaningful one that met starting pitcher Van Hekken's 11th win.

Kim Ha-sung's family visited the stadium on this day, and he quickly caught a hit on the chest of third baseman Yoon Seok-min in the top of the eighth inning and threw it out to first base.

On Aug. 15, in Game 16 of the season against Doosan Bears at Mokdong Baseball Stadium, Seo Geon-chang played in the final defense of the ninth inning.

He showed good performance in both offense and defense on the day, and the commentator kept mentioning the "Kim Ha-sung Project."

He also mentioned that Kang Jung-ho is one of the candidates to occupy the position of shortstop, which will be vacant from the 2015 season due to his entry into the Major League.

He seemed to work out well with his first at-bat hit, but he dropped the ball in the fourth inning due to a bunt failure and a collision with third baseman Kim Min-sung when he defended.

On April 15, in the first game against the SK Wyverns at Munhak Baseball Stadium, he showed a good defense reminiscent of Kang Jung-ho.

On April 19, in Game 3 against the KIA Tigers at Gwangju Baseball Stadium, he played four hits, including a back-to-back home run against Yoon Suk-min.

30, he showed a tremendous record of batting average, slugging percentage, home run, RBI, and OPS among the main shortstop in the 10th team.

On May 1, he recorded one hit and one stolen base from four times at bat in Game 1 against the LG Twins at Jamsil Baseball Stadium.

Against Henry Sosa, he also drew admiration from his fans by showing a unique bat control reminiscent of Kang Jung-ho, who has become a major leaguer.

On June 6, he hit a walk-off home run in the bottom of the 10th inning in Game 2 against the Doosan Bears at Mokdong Baseball Stadium.

It was even more dramatic because he started with a 0:8 deficit and Kim Min-sung's two-run homer in the bottom of the ninth inning tied the score at 8:8.

On September 4, against the Hanwha Eagles, he showed a tremendous defense in charge of all three outcounts in a 6:5 victory at the bottom of the ninth inning.

In particular, the last outcount was the highlight, and the laser throw that caught the runner on first base, Song Joo-ho, at home, was a defense that kept the victory.The 2015 season showed incredible performances in the KBO League, where it is increasingly difficult to find high school graduate monster rookies, even though they did not achieve 20–20, but they are now just 20 years old in their second year as professionals.

On June 18, against the Hanwha Eagles, he fired a two-run shot that broke the tight balance of one-on-one against Yoon Kyu-jin.

On Sep. 19, against the Lotte Giants, he contributed to Nexen's victory by hitting a superb defense in the bottom of the fifth inning by catching all three out-counts by himself and his 19th homerun, which went from 5:0 to 8:0.

It is a season in which he succeeded in joining the 20–20 club by coming up to the third batting order after overcoming a short hitting slump in the early stages.

However, he came out as the second batter and played a consistent role, including a one-run home run against Japan, making up for his sluggish performance, winning a gold medal, and earning a special military service exemption.

In the first round of the playoffs, he received the Daily MVP award for an RBI double leading 1–0 in the 11th inning of extra time.

Although most hitters had a much lower season than last year due to official balls, Kim Ha-sung showed tremendous productivity, with all records except home runs rising significantly.

On May 23, he hit a solo home run against Choi Young-hwan in the third inning in the second game of the season against the Sajik Baseball Stadium Lotte Giants.

After the 2020 season, on November 25, 2020, the Heroes announced it was allowing Kim to enter the posting system to play in Major League Baseball (MLB).

[3] On December 31, 2020, Kim signed with the San Diego Padres of MLB[4] for a four-year, $28 million deal, including a mutual option for the 2025 season.

[8] Kim saw increased playing time at shortstop for the Padres after Tatis was placed on the injured list in late July 2021.

[10] Kim finished the 2022 season with a .251 batting average, 11 home runs, 59 RBI, 12 stolen bases, and a .708 OPS in 150 games played.

On August 21, Kim hit his first major league grand slam against Miami Marlins pitcher Ryan Weathers.