Mayor Anthony Williams this week will travel to Seoul, the South Korean capital and the District’s newest sister city — a Wednesday-to-Sunday jaunt that will end with the mayor having been out of town 20 of the past 40 days.

The mission, financed by the Korean American Business Association of Greater Washington, will “lead to a useful exchange of information and best practices for both cities,” Williams said in a statement. The two capitals signed their sister-city agreement in March.