In 2016, as a Whimoon High School shortstop, he was picked in the first round by the Nexen Heroes and signed with the team.
The breakthrough yearThe year he turned 19, he made his pro debut as a pinch hitter in the opener against the LG Twins, and that December he was named Rookie of the Year. He hit .324, and his 179 hits set a rookie record.
In 2018, he played as the leadoff hitter and won gold at the Jakarta-Palembang Asian Games, a result that earned him a military exemption. He hurt his left shoulder in the postseason that fall and had surgery in November, and in December he won his first Golden Glove.
In 2019, he won a second straight Golden Glove, hitting .336 with 193 hits. In 2020, he set the KBO single-season doubles record with 49 and won a third straight Golden Glove.
In 2021, he played for the baseball team at the Tokyo Olympics, where Korea finished fourth and missed a medal. On the last day of the regular season he won the batting title at .360, becoming, after his father Lee Jong-beom, the first father and son in world baseball history to win it, and he took a fourth straight Golden Glove.
In 2022, his team, the Kiwoom Heroes, lost to the SSG Landers in the Korean Series and finished as runner-up. In the regular season he won five batting titles and was named MVP. He said he won the five titles at the same age as his father.
In 2023, he hit .429 in the middle of the national team lineup at the WBC. In July he hurt his ankle and was out for more than two months, and in December he moved to the majors with a six-year, $113 million deal with the San Francisco Giants.
In 2024, he made his major league debut and hit his first home run in his third game. He had surgery on his left shoulder, which he hurt during a game, and ended his debut season after 37 games.
In 2025, he came back healthy to play from opening day, and hit a home run on his birthday. His final average for the season was .266. In 2026, he had a multi-hit game in a home game the team designated as Korean Heritage Day, and in September he reached 10 home runs in a season for the first time in the majors. A groin injury put him on the injured list late in the regular season.
Jung Hoo Lee (born Aug 20, 1998) debuted in the KBO on Mar 31, 2017, the year he turned 19, and became known the same year when he was named Rookie of the Year. In 2022, the year he turned 24, he won five batting titles and the MVP award together, and at the end of 2023, the year he turned 25, he moved to the majors with a deal with the San Francisco Giants.
Ages are by calendar year (the year minus the birth year), birthdays aside.