You'll find a number of NK operated companies and restaurants in Saigon and Hanoi to help bring in foreign currency.

Also, Vietnam has one of the largest Korean diasporas outside of Korea, as South Korean companies moved all their operations in China to Vietnam in 2013-17 after the THAAD fiasco.

Just about every single product and conglomerate in Vietnam is Korean (specifically Lotte Holdings). Walk down the street and you'd find 3 Lotte Marts. Then go grab lunch at the Lotteria next door. Then call a Grab and ride in a Hyundai back to your apartment in D2 built by Lotte while the driver is playing KPop produced by Lotte Cultureworks, and then watch some KDramas or Vietnamese shows at home produced by Lotte Cultureworks and maybe chill out while drinking some Chum-Churum Soju. Then, next morning, drink some Chillsung Cider to fight the hangover and go to your company, who will end up exporting products back to Korea via Lotte Global Logistics with financing from Lotte Capital. When you end up getting vacation, you'll end up flying to Seoul and maybe take your family to Lotte Hotel World.