https://www.cnet.com/news/lg-halts-phone-manufacturing-in-south-korea-for-2019-relocating-to-vietnam/

With the relocation, the company does not plan to downsize its phone business, however. The move is to make LG "much more competitive for the global market," said LG senior director of global corporate communications Ken Hong. "Korea will continue to be the hub for smartphone R&D, design, quality assurance, etc."  

As reported by Reuters, the factory in South Korea mostly makes premium phone models, which would include devices like the LG G8 ThinQ or the upcoming V50 ThinQ, and manufactures about 10% to 20% of LG's total smartphones. In addition to South Korea and Vietnam, the company also has factories in China, Brazil and India.