Posted : 2021-02-15 15:47 Updated : 2021-02-17 20:26 A voters puts a ballot into a box in a polling station at an elementary school in Seoul in this April 15, 2020, photo, to participate in the general election for the 21st National Assembly. This year's by-elections are set to be held on April 7, with early voting slated for April 3 and 4. Korea Times file By Jung Da-min With less than two months left ahead of this year's Seoul and Busan mayoral by-elections set to be held on April 7, political watchers are forecasting that voter turnout will be a key factor in determining the winners. While there are several variables that could affect voter turnout, one of them is that the elections are being held on a work day, not on a public holiday.