Ghostwriter Tu Cha Cha finds herself reluctantly penning love letters for Miss Wen to hide her romantic escapades. Unintentionally, Tu Cha Cha develops feelings for the letters' recipient, Shen Bu Yan. In a bid to protect Shen Bu Yan from Miss Wen's father's schemes, Tu Cha Cha forms a makeshift family to dissuade him from pursuing Miss Wen.

However, they soon fall into a trap laid by Miss Wen's father, resulting in severe repercussions for their masquerade. Together, Tu Cha Cha, Shen Bu Yan, and their makeshift family navigate a web of deceit, uncovering a shocking conspiracy along the way.

代笔少女涂茶茶，为掩盖温家小姐与他人相好，不得不以温家小姐的名义代写情书，一来二去，却不想爱上了通信之人沈不言。为阻止温家老爷陷害沈不言，涂茶茶组建一个临时家庭冒充温府全家想劝退沈不言，没想到却误入反派温老爷设计的圈套之中，冒名顶替的身份让他们陷入一场杀身之祸。涂茶茶与沈不言及临时家庭携手完美演绎了一场“戏中戏”，掀开了一场惊天阴谋。