As a result of the dispute over forced wartime labor, Japan has placed tighter export curbs on three materials that are used to produce smartphone parts. The materials that have been curbed are fluorinated polyimides, photoresists, and hydrogen fluoride. A number of South Korean tech companies, and their employees will be impacted by this move. The country relies heavily on Japan for these materials, as Japan dominates the three aforementioned markets.
See "The high-tech trade dispute rooted in Japan's wartime history", Makiko Yamazaki & Heekyong Yang & Ju-min Park, Reuters, July 8, 2019