Originally Posted by Drip

That's because you also got the bonus items from clearing the whale maps first times, which gives some quest rewards. Whale map 1_5 gives only 200 medals, so you'll have to run that one 30 more times to reach 7,000.

I prefer wait for 10-5 or at least 5-5 to farm whale coin.
And I know it' has reward for first clear, I already at 10-4 whale campaign on DMM.
So I said it still waste time to farm in whale map this early.