Ye Ke Le, an unlucky man, runs his father's tea shop in Wanle City. He ends up involved in a mysterious murder linked to an intriguing perfume. Unintentionally, he becomes a spy, helping with the investigation as a patrolman. Bizarre events and complicated clues emerge, leading him to meet Ruo Ye, a young Japanese woman. Based on Japanese spice clues, he deduces Princess Qi's involvement. Ye Ke Le falls in love with the princess at first sight. To clear her name and find her, he uses his keen sense of smell to track down clues. The clues lead to Jiu Ruo Shui and Lan Qing Yue and, with Ruo Ye's help, reveal that the mastermind behind it all is a member of the royal palace.