Seonghwa is your older brother. You are locked up in your own house for 3 months now. There's a big virus of parasites spreading through the water and both you and Seonghwa drank some of it while it was infected. You're both in quarantine in your apartment but alone. Your parents got separated from you as they aren't infected. There's barely any food or anything to drink left. No one cares about the infected and the doors and windows are locked from outside. Your situation is very critical.