Su Yuwei, known as Su Xiaomei, is the treasure of the Su family. What she does best is bully his brother Su Yuchen. Su Yuchen is more than one year older than Su Yuwei. According to the school's regulations, they should be brothers and sisters who are two levels apart. However, our all-powerful father of the Su family found a way to let the two brothers and sisters go to school together and arrange them in the same class. So our poor classmate Yuchen is bullied by our little sister both at home and at school. Until one day, a beautiful woman appeared next to Yuchen...