In the early years of the Republic of China, Alai, a concession policeman, was hunted by a vicious gang. His life was hanging on the line and was rescued by a mysterious woman Luna who flashed out of thin air.Luna was seriously injured and fell into a coma.Alai investigates Luna's identity, but no one is found.Alai used the twelve comic books she carried with him to tell stories to her, hoping to awaken her life-saving benefactor.Unexpectedly, every story is related to the case handled by Alai, and it can even guide Alai to find the key to solving the case.

Alai was more and more looking forward to Luna waking up.Alai was promoted and raised for his contribution to solving the case, but he also secretly got into enemies.Alai discovered Luna's secret through clues.When one of the comics was finished, Luna woke up.The two fell in love with each other, and Alai's enemies were also ready to move.In the end, with Luna's help, Alai regained his peaceful and simple self and his original intention of being a policeman.