Han, who was the sole candidate in the race, won by a majority in a vote that combined ballots from both lawmakers and party members. The exact vote tally was not disclosed under the party's internal election rules.
Despite some debate within the party over how to proceed when there is only one candidate, the party decided to hold the vote.
DP leader Chung Cheong-rae described Han as "a leader with a gentle personality, flexibility in leadership, and strong attention to detail."
Ahead of the vote, Han pledged to support the current administration's agenda with decisive leadership and to work closely with fellow lawmakers on legislative priorities, pushing them through parliament by year's end.
Assuming the post in January after then-floor leader Kim Byeong-gi abruptly stepped down amid various allegations, Han has been credited with stabilizing the party over the past four months before resigning on April 21 to run again.
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