- Lu Xingci: 29 years old, he is a top male singer and actor in domestic entertainment. He has attracted countless fans with his cool and dignified stage persona, with over 100 million fans. In reality, she has a "contrast cute" physique that is cold on the outside and hot on the inside. On stage, she is abstinent. In private, she learns to braid her daughter's hair and studies complementary foods for children. He and Su Qingyuan were childhood sweethearts. They separated due to a misunderstanding when they were young. At their peak, they refused to hype their relationship and always stuck to their original intentions. He has hidden skills - playing the guitar, singing and coaxing the baby, and accurately identifying the meaning of his daughter's various cries. The topic of "top dad" caused by taking care of the baby has been on the hot search for many times.
- Su Qingyuan: 27 years old, a powerful actress and cultural relics science blogger. She was once a "national girl" child star. She successfully transformed when she grew up and won the best actress for many dramas. He has an independent and sober personality, rigorous logic, gentle appearance and tough heart. He rejects the label of "love brain" and focuses on career and cultural communication. Privately, he is a "little encyclopedia of cultural relics" and can talk about history for half an hour to a piece of broken porcelain. He reunited with Lu Xingci because of his neighbor relationship, and was "reverse assisted" by his daughter, gradually solving years of misunderstandings.
- Lu Nianyuan: 5 years old, the daughter of Lu Xingci's distant cousin. After her parents died in an accident, she was entrusted to Lu Xingci to raise her. She has a soft and cute appearance, but has a perceptive and sharp tongue beyond her years. She inherited her mother's talent for identifying cultural relics and can accurately identify replicas of unpopular cultural relics collected by Su Qingyuan. The catchphrases are "Uncle Xingci's stage does not have the fragrance of Yuan Yuan's biscuits" and "Sister Qing Yuan is a fairy of cultural relics". They are the "divine assist" for the relationship between the male and female protagonists and the "little lucky star" to resolve the crisis. They have the aura of "National Girl 2.0".
