She’s got Seoul! South Koreans have found an obsession other than K-Pop — White House Press Secretary Karoline Leavitt. Koreans are learning English by studying Leavitt’s daily briefings, thanks to a wildly popular YouTube channel that slices up her appearances into free bite-sized English lessons — translating her expressions and colloquialisms into their native tongue. What drew hundreds of thousands of fans after last year’s launch was her phrasing –delivered with a smile or occasional scowl