Members of the Kakao labor union stage a rally outside the Pangyo Station in Seongnam, Gyeonggi, on May 20. [YONHAP]

Kakao said on Friday that a compensation package demanded by its union could place a huge burden on the company's operations, following the union's announcement that it would proceed with a strike next month.

The official statement came after Kakao's management and its labor union failed to reach an agreement in the second round of negotiations mediated by the government. Unionized workers at Kakao's five units, including its headquarters, Kakao Pay and Kakao Enterprise, had previously voted in favor of a walkout.

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“The total amount of compensation package demanded by the union is on a level that could place a huge burden on the company's operations,” the operator of Korea's popular messenger app said in an official statement.