The walkout ran from 10 a.m. to 3 p.m. with an hour-long midday break on Wednesday, amounting to about four hours of stoppage.
Union members marched through the company's Pangyo branch in Seongnam, south of Seoul. Workers at five entities — the main Kakao corporation Kakao Pay, Kakao Enterprise, DKTechin and XLGames — joined the action after wage talks collapsed and mediation broke down.
At the heart of the conflict lies the bonus structure, with the union demanding payouts worth about 10 million won, or 13 to 14 percent of last year's operating profit, while opposing the inclusion of restricted stock units.
Management has argued the demands would place a heavy burden on the company's finances.
Shares of Kakao traded at 38,450 won per stock at 10:20 a.m., 2.66 percent lower than the previous day.
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