When did chang myon (장면) leave office?
CREATE TABLE "republic_of_korea_1948_presents" (
  "president" text,
  "vice" real,
  "romanized_hangul" text,
  "took_office" text,
  "left_office" text,
  "political_party" text
);
SELECT "left_office" FROM "republic_of_korea_1948_presents" WHERE "romanized_hangul"='chang myon (장면)';