After searching for his wife and daughter for years, Chen Jianchuan returns and is hired to play an unfaithful father in a livestream, only to be recognized by his daughter through the smallest details. A paternity test, 73 old letters, account books, and maintenance records gradually come to light, helping unravel the clues to an old case. Zhao Nian goes from being told what to say to speaking the truth of her own accord. Chen Jianchuan protects his daughter by relying on evidence and following the rules, while also restoring the good name of a former driver. Through repeated explanations and revelations, father and daughter learn to trust each other, giving their long-delayed reunion a solid foundation.