Arthdal Chronicles depicts the birth of civilization and nations in ancient times. It is a story of mythical heroes, their struggle, unity and love of people living in a virtual land called Arth.

It's the story of a mother who died and begins a 49-day long project of reincarnation and a husband who has barely begun to live a new life after overcoming the pain of losing his wife.

A story that reveals the whole story of a friendship that has been changed over 20 years based on the death of a friend of Jang Jae-kyeong, an ace detective in a drug squad who is forcibly addicted to drugs.