European roulette has 37 pockets, 0 through 36. With a single zero the house edge is 2.7%, lower than double-zero American roulette.
You start with ₩1,000,000 and chips start at ₩50,000. While your balance is ₩1,000,000 or more, signed-in players are ranked by peak balance. Go broke and you can start again. No real money is involved.