A vehicle promoting Democratic Party presidential candidate Lee Jae-myung's presidential campaign is being inspected before approval at a facility in Gyeonggi Province on Sunday. (Yonhap)
A vehicle promoting Democratic Party presidential candidate Lee Jae-myung's presidential campaign is being inspected before approval at a facility in Gyeonggi Province on Sunday. (Yonhap)

Democratic Party presidential candidate Lee Jae-myung was set to begin his official campaign in central Seoul on Monday for the June 3 presidential election.

Seven candidates made their bids official for the presidential vote, triggered by the impeachment of former President Yoon Suk Yeol over his failed martial law bid in December, with Lee expected to face People Power Party candidate Kim Moon-soo.

Public opinion polls have showed Lee has kept his lead, as the PPP had been in an internal rift on a possible candidacy merger between Kim and former Prime Minister Han Duck-soo last week.

Lee will launch his campaign at Cheonggye Plaza near Seoul's Gwanghwamun, which the DP chose as a symbolic place representing the ouster of Yoon.

After the rally, Lee will travel to what he labels as the "K-Initiative Belt" -- the suburban cities of Seongnam and Hwaseong in Gyeonggi Province, and the central city of Daejeon.

He plans to hold a meeting with innovative industry workers in Pangyo, just south of Seoul, and campaign on the themes of semiconductors and technology in Dongtan and Daejeon.

Later in the day, the DP's election committee will unveil Lee's key campaign pledges at the National Assembly. (Yonhap)