A woman with only a short time to live and a man with the supernatural power to bring the world to an end discover the true meaning of life and love.

4 young men who don't have jobs face a woman in an alley. The woman says "save me."

Lee Yool falls off a cliff and nearly dies in an attempted assassination. He loses his memory, and wanders for 100 days under a new name and personality. During this period, he meets Hong Sim, head of the first detective agency in Joseon.