A mysterious app promises wishes — then starts a countdown to death. As a group of teens becomes entangled, they must break the deadly chain to survive.

When a ghost-seeing heir and an ace prosecutor learn that a single touch makes them a strangely effective duo, they team up to crack unsolved murders.

Right after Ryu Sun-jae, a top star, ends his life, Im Sol, his top fan, somehow ends up at a time when they were in high school and tries to…