The official campaign period for the July 30th by-elections starts today.
Ruling and opposition party candidates will compete in 15 districts around the nation and they'll have 13 days until the day before the elections to persuade voters in their district.
Six of the 15 seats up for grabs are in Seoul and its surrounding areas.
Two and four in the Gyeongsang-do and Jeolla-do provinces, respectively.
Three constituencies are in the Chuncheong-do provinces.
Early voting will be available for two days starting on Friday July 25th, but voters will only be allowed to vote in their designated district polling stations.