Name the period for south korea with peak position of #1
CREATE TABLE table_name_90 (period VARCHAR, country VARCHAR, peak_position VARCHAR)
SELECT period FROM table_name_90 WHERE country = "south korea" AND peak_position = "#1"
### Context: CREATE TABLE table_name_90 (period VARCHAR, country VARCHAR, peak_position VARCHAR) ### Question: Name the period for south korea with peak position of #1 ### Answer: SELECT period FROM table_name_90 WHERE country = "south korea" AND peak_position = "#1"