- Female protagonist: Su Xiaotuan (nicknamed Tuan Tuan), five and a half years old, with superior IQ, meticulous logic, and her own "human polygraph" skill (can judge lies through micro-expressions). Due to the demolition of the orphanage, she was "packed" and sent to the home of the guardians she had never met - the four nominal "fathers". He has a flamboyant personality and is good at talking nonsense in a serious manner. His goal is to find his biological father and help four "cheap dads" solve their problems.
- Four "fathers": They became the legal guardians of Tuan Tuan due to the "mutual aid agreement" they signed in their early years. They were forced to live together despite not knowing each other. Their careers cover the entertainment industry, business, academia, and sports, and each has its own weaknesses and hidden skills.
- Style: Abuse-free throughout, focusing on "taking care of one another" and "all members cheating and doting on each other". It has a fast pace, lots of laughs, and is interspersed with slap-in-the-face plots. At the end, the identity of the biological father is revealed and the achievement of "five fathers living in harmony" is achieved.
