In the early years of the Republic of China, police officer Alai in the concession was chased by a vicious gang and was on the brink of death when he was rescued by a mysterious woman named Luna who appeared out of nowhere. Luna was seriously injured and unconscious as a result. Alai investigated Luna's identity, but found no one there. Alai used the twelve comic books she carried with her to tell her stories, hoping to awaken her savior. It was out of expect action that every story would be related to the cases handled by Alai, and could even guide him to find the key to solving them. Alai was looking forward to Luna waking up even more. Alai was promoted and given a raise for his contributions 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 reading, Luna woke up. The two of them developed feelings for each other, and Alai's enemy also became restless. In the end, with Luna's help, Alai regained her peaceful and pure self and her original intention of becoming a police officer.
