The guy has a power in his eyes. He had it since he was born. He learns how to use his power. After learning it he used his eyes on gambling. He can see the winning numbers on the roulette. After all that fame he got, the power slowly fades away. When the power in his eyes is totally gone, he becomes a man with a lot of debts. Even his family disowned him. He goes to his girlfriend to ask for money, she got angry and said she wanted to break up and that was the last money that she would give to the guy. I think the girl works in a restaurant or a coffee shop or something I cant remember.
The guy leaves the shop after he received the money through mobile. The guy then started walking thinking deeply about his misfortune. He eventually ended in a park where a mysterious woman contractor appeared and offered to give the guy a chance to redeem himself and pay all of his debt. The guy was thinking if he will accept it or not. In the end, he accepted the offer. But not under a total contract but an invitation. He was then given a special seal coming from the contractor. I think those seals were given to the contractors by their gods. I don't know what these seals can do.
The guy texted his girlfriend so they can meet up and apologize. Then the guy waited for his girlfriend to come but he was already transported to another world. When the girl arrived to meet him, her ex-bf was gone and she only saw a used cigarette on the floor. She had no idea where the guy went or what happened.