Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27681 ( "22/06/2008" text, "Indonesia Super Series 2008" text, "S.Series" text, "7800.00" text, "Runner-Up" text )

### Question ###
Which series occurred in which the semi-finalist was runner-up and the 7800.00 was 6420.00?

### Accurate SQL ###

SELECT "Indonesia Super Series 2008" FROM table_27681 WHERE "Runner-Up" = 'Semi-Finalist' AND "7800.00" = '6420.00'