Han Dong-hoon greets supporters at his campaign office in Busan after winning the parliamentary by-election in Busan's Buk-A constituency on Thursday. Yonhap

Independent candidate Han Dong-hoon won a closely watched parliamentary by-election in Busan's Buk-A constituency Thursday, capping a dramatic political comeback months after being expelled from the People Power Party and boosting his standing within the conservative camp.

According to the National Election Commission, Han won 42.99 percent of the vote with 99.5 percent of ballots counted, defeating Democratic Party candidate Ha Jung-woo, who received 41.24 percent. People Power Party candidate Park Min-sik finished third with 15.76 percent.

Han hailed the result as a "historic victory" and pledged to fulfill the mandate entrusted to him by voters.

The victory marks a remarkable turnaround for the former justice minister and ex-ruling party leader, who entered politics in December 2023 when he was appointed head of the People Power Party's emergency leadership committee ahead of the 2024 general election.