The train station.

Y/N L/N is in major debt,one night she's approached by a man in a train station,he offers a game of ddakji,Y/N picks blue,he offers for her to play with her body(not like that ya nasty f*cks)a slap,in return for money if she wins,even if it's just once.The salesman gives her a card,syaing 'i'll hope to see you in the games'
(The salesman is the front man in this)