Go to the last room of Mythic Rooster and say "Rabbit."

Collect these items:

1 Earth key
4 Hyunmoo keys
1 Holy water
4 Lucky coins

After collecting the items, go back to the last room of the Mythic Rooster and there will be a quest update.

Kill 3 Defender rabbits and 3 Spirit rabbits.

Return to the last room of Mythic Rooster say "Rabbit."

You will get:
- Lesser Alliance with Rooster legend mark
- Mythic Heart
- Karma

Tips:
When you first enter the last room, bring all the items you need, so don't go back and forth twice.