In this drama, Ma Dong Chan, a famous producer, and Go Mi Ran, a part-time worker burdened with family debts, sign up for the "24-Hour Frozen Human Project." What was meant to freeze them for just a day ends up keeping them frozen for two decades. To survive, they must keep their body temperature below 33°C. As they thaw, they are forced to confront unresolved personal issues while adjusting to a world that has moved on without them, all while trying to pay off their family's debts.