,
Kaohsiung on 17 November 2018. In May 2018, Han won the Kuomintang's
Kaohsiung mayoral primary, defeating rival
Chen Yi-min, and was subsequently nominated as the party's mayoral candidate. During the initial campaign stage, he received almost no support from the party as he was seen as unlikely to win the election due to the traditionally deep-rooted
Democratic Progressive Party presence in Kaohsiung. However, his popularity soared within months during the campaign period, a phenomenon which has been termed "
Hánliú" (). The main focus of his campaign was on the air pollution and economic growth of Kaohsiung. Despite his claims of having minimal support for his Kaohsiung election, accordingly to paperwork filed with the
Central Election Commission, Han received and spent the most compared to the other mayoral races in Taiwan. Campaign contributions totaled NT$129,149,779 (US$4,304,992) and expenses totaled NT$140,873,536 (US$4,695,784). The amounts exceeded the NT$88,841,000 cap placed by election rules. Han defeated
Chen Chi-mai in
local elections held on 24 November 2018, and became the first mayor of Kaohsiung affiliated with the Kuomintang since
Wu Den-yih left office in 1998. The success of the KMT during the elections has been attributed to Han's popularity. The day after he won the mayoral election, Han invited
Foxconn to invest in Kaohsiung. In addition, he sought fluent English speakers to fill vacancies in his administration pertaining to promotion and public relations. Han expressed support for the
1992 consensus and stated that he would form committees dedicated to
Cross-Strait relations. On 3 December 2018, it was announced that former
Transportation and Communications minister
Yeh Kuang-shih would be Han's deputy mayor.
Lee Shu-chuan was appointed as a second deputy mayor on 15 December 2018. Han was inaugurated on 25 December 2018. During the ceremony, he promised to promote Kaohsiung products, facilitate the inflow of money to the city, pay off the city's debt and invest in future generations via bilingual education. On 24 February 2019, Han began a five-day trip to
Malaysia and Singapore to discuss business and tourism opportunities for Kaohsiung, his first official overseas visit as mayor. In March 2019, Han and a delegation of municipal officials visited Hong Kong, Macau and
Mainland China for a seven-day trip to discuss agriculture. Members of the delegation included Han and his wife, deputy mayor
Yeh Kuang-shih, and ten
Kaohsiung City Councilors. In Hong Kong, Han met with
Hong Kong Chief Executive Carrie Lam at the
Government House, followed by a visit to the
Hong Kong Liaison Office, where he met with the office director
Wang Zhimin, making him the first ROC politician to ever visit the liaison office, a move that was criticized by the opposition
DPP as promoting unification under "one country, two systems." In Macau, he met with the
Macau Chief Executive Fernando Chui to discuss public health and sign a trade agreement between the two cities. He also visited the
Macau Liaison Office and had a dinner with the liaison office's director
Fu Ziying. In
Shenzhen, Han met with
Taiwan Affairs Office Director
Liu Jieyi and Shenzhen
Communist Party Secretary Wang Weizhong. The total value of trade deals signed during Han's visit totaled NT$5.2 billion. On 9 April 2019, Han embarked on a nine-day visit to the United States, where he visited
Boston, Los Angeles, and
Silicon Valley. During the trip, Han sought to encourage American investment in Kaohsiung. He met with
Congresspeople Ted Lieu and
Judy Chu and also Los Angeles Deputy Mayor
Nina Hachigian. Han also gave talks at
Harvard University and
Stanford University.
Recall Han returned to Kaohsiung and resumed mayoral duties on 13 January 2020. On 17 January 2020, a petition to recall Han cleared the first threshold with 28,560 signatures, exceeding the required 1% of the electorate (22,814 signatures). On 7 April, the city's electoral commission verified that 377,662 of approximately 406,000 signatures collected in the second phase of the recall petition were valid, clearing the threshold of 10% of the electorate, setting the stage for a
recall vote in June. Though he urged his supporters to boycott the vote, he was recalled with 40% of voters turning out, and 97% voting in favor of the recall. ==2020 presidential campaign==