Ling Yuan, born hard of hearing, serves as the personal shadow guard to the Third Prince and constantly mishears his orders, leading to all sorts of amusing incidents. To investigate the movements of his political rival, Wen Huaijin, she disguises herself as a shaobing vendor and sets up shop outside his residence. As they spend more time together, Wen Huaijin's gentle and benevolent nature gradually wins her heart. An unexpected assassination attempt gives Ling Yuan the chance to move into the Wen residence, but her habit of mishearing her master's instructions leads to a series of hilarious misunderstandings. While navigating these complications, she catches glimpses of undercurrents at court, witnesses Wen Huaijin's wholehearted efforts to help displaced refugees, and rescues an old friend mistreated by the powerful. Once all the misunderstandings are cleared up, the prince and Wen Huaijin put aside their political rivalry and join forces to expose the villains' misdeeds.