High Energy Alert! A Little 'Milk Bun' Descends and Shakes Up the Wealthy Family

Niuniu, a five-year-old girl with pigtails, lives alone with her mother Helian Meiwen, who is dying of pancreatic cancer. Despite her young age, Niuniu is perceptive and tries to cheer her mother up. Helian Meiwen, knowing her time is short, arranges for Niuniu to be taken in by her brothers. She makes a phone call to Helian Yao Kai, entrusting him with her daughter. The next morning, Helian Meiwen passes away peacefully in her sleep. Helian Yao Kai arrives to find his sister dead and Niuniu alone. He takes Niuniu to the Helian family old mansion, a grand estate combining a siheyuan and a castle. Niuniu is initially confused about her mother's absence but is coaxed by her uncle. Along the way, Niuniu's inner system records increasing favorability and merit points from her interactions with Helian Yao Kai, revealing she has a mysterious system that rewards her for positive interactions.

At the mansion, Niuniu meets her grandmother, the Old Lady, who is deeply grieved by her daughter's death but shows kindness to Niuniu. The extended family gathers for lunch, where Niuniu is warmly welcomed by some but met with suspicion by others, particularly a distant relative who questions her parentage. After lunch, Niuniu goes to play in the back garden with other children. A boy named Haohao, prompted by his mother's earlier words, bullies Niuniu, calling her a bastard and claiming her mother is dead. Enraged, Niuniu fights him, pinning him down and beating him. The commotion brings the adults. The Old Lady arrives and, after learning the truth, banishes Haohao and his mother from the family, firmly declaring Niuniu as the legitimate little princess of the Helian family. Helian Jinchu, Niuniu's older cousin, supports her, having already punished Haohao.

To solidify Niuniu's status, the Old Lady decides to hold a grand welcome party combined with Niuniu's sixth birthday, scheduling it ten days later. Another relative, Chen Youyou, a talented girl who is used to being the family's favored child, feels threatened by Niuniu's arrival and boasts about her piano and dance skills, hinting at her desire to perform at the party. Meanwhile, Niuniu's system continues to accumulate merit points, which she can use for skills like instantaneous movement. She realizes the value of positive family interactions. The story establishes Niuniu's new life within the powerful Helian family, her bond with her uncles and grandmother, and the challenges she faces from jealous relatives, all while her secret system aids her on her path.