This game has a hidden quest (but it's a daily quest type)

I did it at a leisurely pace, but it's still pretty easy, cleared within about 45 minutes. If you complete the payment hidden quest at the end, you get 80,000 gems and 2 item boxes. If you do the math, paying real money is much more profitable. 2500 coins buy 5000 won worth of Google Points. So, 500 coins is 1000 won. If you make just one payment around 1000 won in the game, you get 80,000 gems, so you'd be foolish not to do it. I got 2 x 10,000 gems from the boxes, for a total of 100,000 gems. Do it before it disappears, guys ㄱㄱ The hidden quest is daily type, and you can get it up to 7 times.