「Have you ever regretted something in your life? If you had the chance to rid yourself of that regret, would you?」 Two doctors traverse backwards through the memories of a dying man. All for the sake of fulfilling that dying man's last wish.

“He auditioned for The Unit,” Dowoon said, voice shaking like crazy. “Junhyeok-hyung is joining a survival show.” || Day6 members try to cope, Junhyeok tries his best, and tons of memories are thrown along for the ride.