Ma Dong-chan, a successful variety show producer, and Go Mi-ran, a part-time worker, participate in a 24-hour human freezing experiment. Due to a mysterious conspiracy, they do not wake up after 24 hours as planned, but instead wake up 20 years later in the year 2019. They discover that everyone they knew has aged, while they remain physically unchanged. To survive, they must maintain a core body temperature of 31.5 degrees Celsius. As they struggle to adapt to a world that has moved on without them, they find themselves drawn to each other, sharing a unique bond forged by their shared trauma. They must navigate the complexities of their new reality while uncovering the truth behind the experiment that stole two decades of their lives.