A tragic accident leaves an ambitious prosecutor with the mind of a child — forcing him and his mother to embark on a journey to heal their relationship.

Choi Su Jung, a 16-year-old high school student, is brutally murdered by a serial killer. Her friend Young Jin gets to take a phone call from the killer and says that she’ll find and kill him. Over two decades later, Young Jin has become a police officer and still desperately tries to find the serial killer. She has a young, middle-school-student neighbor Eun Ho. He gets shocked by what’s inside Young Jin’s room when he comes over to her place.

Lee Jae-Sang (Rain) is a lawyer at JK Law Firm, which is one of the biggest law firms in South Korea. He is an excellent lawyer, but he only cares about winning for his benefit. One day, he has a mysterious car accident and he is drawn into a parallel world. There, Lee Jae-Sang finds himself working as a prosecutor. He is strict in carrying out the law. He is married to Ra Shi-On (Lim Ji-Yeon), who loves Lee Jae-Sang and is faithful to him. In the world where Lee Jae-Sang came from, he broke up with Ra Shi-On ten years earlier and Ra Shi-On works as a detective. Lee Jae-Sang struggles to cope with his different selves.

The Hotel Del Luna, located in Seoul, is not like any other hotel: its client are all ghosts. Jang Man-Wol, stuck in the hotel for the past millennium, meets Koo Chan-Sung, the new manager.

Drama series depicts the life of Hong Gil-Dong who is the the first revolutionist and dissident activist in Joseon.

The story centers on thieves who strike against people in high power who try to control Korea.