The five U.K. firms present in Seoul—Clifford Chance, Herbert Smith Freehills, Linklaters, Stephenson Harwood and Allen & Overy—will have to either re-register their office licenses or close their offices, at least temporarily.

A group of U.K.-based law firms in South Korea are anxious about the future of their offices in Seoul, as a no-deal Brexit could force them to close their offices temporarily.