By order, login, defeat 100 monsters, 5 dungeon clear, 10 dungeon clear, 2 PVP Matches(Random).
These five categories allow you to get one stamp which will be randomly assigned to the bingo board.
Once one of the lines are filled, you can claim the reward for that section.
The stamps reset at Midnight in Korean time.
And by 3, 12, and 20 stamps, you can get an additional item at the bottom.
3x: DIM Random Costumes Box
10x: 2-star Hair Random Box
20x: 2 Dimensional Vaccines