At Seorin High School, a mysterious app called Girigo begins appearing on the phones of select students without explanation. The app grants any wish typed into it, but each wish comes with a hidden consequence tied to a countdown. As students begin to realize their desires are being fulfilled, fear spreads through the school when those who use the app start disappearing once their timer reaches zero. What first seems like coincidence quickly turns into a pattern that cannot be ignored. When Choi Hyeon-wook reveals he used Girigo to pass an exam, the truth becomes undeniable. A small group of students is pulled into uncovering the app’s origin, its rules, and why it chooses certain users. As the countdowns continue, they must figure out how Girigo works—and whether anyone can escape it before the next wish runs out of time.