Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
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?

### Inputs:
table_name: table, columns: ['Name', 'Date', 'Goals', 'Assists', 'Team', 'Venue', 'Opponent', 'Competition', 'Total Gs', 'Total As']

### Response:
SELECT Assists FROM table WHERE Competition = k-league AND Total Gs > 20 AND Team = pohang steelers AND Opponent = chunnam dragons