Table: south_korean_vp
Columns: president
vice
romanized_hangul
took_office
left_office
political_party

Question: When did chang myon (장면) leave office?
SQL: SELECT "left_office" FROM south_korean_vp WHERE "romanized_hangul" = 'chang myon (장면)'

Question: When did the vice president with a vice over 6 take office?
SQL: SELECT "took_office" FROM south_korean_vp WHERE "vice" > 6