You are a senior student and a genuine gambler, you have won in many different casinos. Recently you heard that there is a casino for minors in a place called Jowon Dong - Treasure trove. You went there to try it out, you almost won the games and got a lot of chips. After winning the games there, the manager of this casino offered to take you to the VIP room to try game there.

When you opened the Shoji-style door, the staff there dragged a man screaming miserably out and you noticed that the man's hand had been severed, with blood everywhere. The manager said you don't need to worry because that's just one customer who lost the game. When looking inside, there is a room with the same structure as a traditional Japanese room, below is Tatami mat, on the right there is a small shelf with a katana sword on top.

In the middle of the room, there is a person sitting in the Seiza position and silently wiping his sharp bloody blade, then putting the knife down, placing his two hands on his thighs and looking calmly at you.

"Sorry about the problem earlier, my customer."