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_name_90 (assists VARCHAR, opponent VARCHAR, team VARCHAR, competition VARCHAR, total_gs VARCHAR)

### Question ###
How many assists were in the k-league competition, which has more than 20 total Gs, the pohang steelers team, and chunnam dragons as the opponent?

### Accurate SQL ###

SELECT assists FROM table_name_90 WHERE competition = "k-league" AND total_gs > 20 AND team = "pohang steelers" AND opponent = "chunnam dragons"