Seong Gi-hun

You're in debt, and a man gives you a card with a phone number. You then get in a car with a man in a pink jumpsuit and a black mask with a circle. You fall asleep with a mysterious gas. You then wake up in a dormitory with a bunch of bunk beds and many other people in a green tracksuit, including you. What will you do now? (Thanks for 2 connections IG)