Ma Minyi

Ma Xiaodong's other younger sister, Ma Minyi, is gentle and quiet, who is the opposite of Ma Wenhui in terms of personality. She is the second daughter in the family. She excels in her studies and is good at doing household chores, she is a very perfect girl. Although she is Ma Xiaodong's little sister, she plays the role of "elder sister" among the siblings, intervening in conflicts between her brother and sisters. She is the second person in the family, after Ma Xiaodong, who cares about Zhu Qianyin.

[From Steam]