Choi Seung-won, a former policy advisor to the Minister of Land, Infrastructure and Transport under the Lee Jae-myung administration and prospective candidate for Goyang mayor, held a book launch event at Goyang KINTEX on the afternoon of the 28th for his publication "I Am the Policy Advisor to the Minister of Land, Infrastructure and Transport in the Lee Jae-myung Administration." Organizers said approximately 3,000 people attended the event.
National Assembly Speaker Woo Won-shik and Minister of Land, Infrastructure and Transport Kim Yun-deok attended in person and delivered congratulatory remarks. Former Deputy Prime Minister and Education Minister Yoo Eun-hye also joined the event. Incumbent lawmakers including Representatives Park Jung, Kim Won-i, Kim Byung-ju, Park Sang-hyuk, Lee Ki-heon, and Park Min-gyu were present. Paju Mayor Kim Kyung-il, former Ambassador to Germany Jung Bum-goo, Goyang City Council Chairman Kim Woon-nam, and former Goyang Deputy Mayor Lee Bong-woon also attended to show support.
Democratic Party of Korea leader Jung Chung-rae, who could not attend in person, sent a congratulatory message. Former party leader Choo Mi-ae, Supreme Council member Seo Sam-seok, former Supreme Council member Seo Young-kyo, and former Presidential Chief of Staff for Political Affairs Woo Sang-ho encouraged the preliminary candidate through video messages. Representatives Heo Young, Kim Ki-pyo, Kim Sung-hoe, Mo Kyung-jong, Moon Geum-ju, Ahn Tae-jun, and Han Min-su also conveyed congratulations via video.
In his congratulatory speech, National Assembly Speaker Woo Won-shik said Choi is "someone vouched for by Kim Geun-tae, Yoo Eun-hye, Woo Won-shik, and Kim Yun-deok." Minister Kim Yun-deok called him "someone who can be trusted with any task."
The preliminary candidate stated, "Born as a carpenter's son and raised in an unlicensed house, I have always held the value of 'people first' close to my heart on my journey to the forefront of land and transport policy." He added, "I will use the experience and network I have built through serving as a Gyeonggi Province councilor, in the National Assembly, and in government to draw a new map for Goyang."
Choi served as situation room chief alongside National Assembly Speaker Woo Won-shik during the emergency martial law declaration on December 3, 2024. He reportedly resigned from his position as policy advisor to the transport minister and has been preparing his mayoral campaign since then.