In the early years of the Republic of China, Alai, a police officer in the concession, was hunted down by a vicious gang. When his life was hanging by a thread, he was saved by a mysterious woman named Luna who appeared out of nowhere. Luna was seriously injured and fell into a coma. Alai investigated Luna's identity, but there was no such person. Alai used the twelve comic books she carried with her to tell her stories, hoping to wake up her savior. Unexpectedly, each story was related to the case Alai handled, and could even guide Alai to find the key to solving the case. Alai was looking forward to Luna waking up more and more. Alai was promoted and given a raise for his meritorious service in solving the case, but he also secretly provoked his 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 make a move. In the end, with the help of Luna, Alai found his peaceful and simple self and his original intention of being a policeman.