Three young men from wealthy families have completely different personalities. One is outgoing and carefree, another is cold and taciturn, and the third is gentle and refined. Their families arrange for them to stay with Liang Manman to improve their behavior and temperament. All Liang Manman wants is to earn enough rent money without any trouble, so she becomes their manager and establishes a system of rewards and punishments. Although the three men usually keep their distance from one another, they always join forces to protect her whenever she finds herself in trouble. Determined to win a little red flower, the young men secretly compete with one another, gradually falling in love along the way.