In a world where an AI programme allows people to communicate with their deceased loved ones, a flight attendant and a mother question the meaning of reality and humanity.
Ex intelligence agent Ki-heon is tasked with safely transporting Seo Bok, the first ever human clone, who holds the secret of eternal life. Several forces try to take control of Seo Bok to serve their own agendas.
After trying to cover up a car accident that left a man dead, a crooked homicide detective is stalked by a mysterious man claiming to have witnessed the event.
A blind witness and a runaway help the police find the suspect in a hit and run until the culprit realizes that they are close on his trail. The killer tracks her down and Soo-ah realizes that in order to save Gi-sub she would have to risk her life.