" A Daughter-in-law " was a high-profile online literary work in 2021. It was known as the " first hit of 2021." The main reason why it could make people unable to stop was the following: Unique storyline: " Dub Son-in-law " tells the story of Qin Fen, a man born in poverty but with outstanding talent and open-minded character, who grew up and struggled in officialdom and family. This story not only contained fierce political struggles and interpersonal conflicts, but also emotional entanglements and human thoughts, making it very readable and enjoyable. 2. Wonderful character images: Many characters with distinct personalities and profound images were created in " Duet Son-in-law ", such as Qin Fen's relatives and friends, official opponents, family elders, etc. Not only did these characters have their own stories and backgrounds, but they also had their own unique personalities and behaviors, which gave the readers a strong emotional resonance and a sense of immersion. 3. In-depth plot setting: There are many exquisite plot settings in " Duet Son-in-law ", such as the setbacks and difficulties encountered by Qin Fen in the officialdom, the internal disputes and interest struggles within the family, etc. These plots not only show the complexity and variety of human nature, but also arouse the readers 'thinking and reflection, making it very thoughtful and deep. 4. Good writing and narrative skills: The writing style of " Duty-husband " is smooth and the narrative is delicate, full of the atmosphere of classical literature. The author had a deep understanding and research of the politics, culture, history and other aspects of the Tang Dynasty, which made his works more vivid, real and convincing. To sum up, the reason why " Duel Son-in-law " was so addictive was because it had a unique storyline, wonderful characters, in-depth plot setting, good writing and narrative skills. These factors combined to make this work a well-loved online literature work.