Meng Xinghui, a modern office worker, unexpectedly transmigrates into a novel and becomes a villainous supporting character whose circumstances have fallen into ruin. Bound by a system, she must maintain the persona of a pampered young heiress. With no other choice, she turns to her fiancé, the cold-faced CEO Lu Shiyan, for shelter. While living under his roof, Meng Xinghui juggles the system's bizarre missions and tries to live sincerely, rescuing a stray kitten and treating the original heroine with kindness. Her lively and straightforward personality gradually melts Lu Shiyan's heart, and the two develop feelings for each other as they spend time together. When the system's missions finally come to an end, Meng Xinghui sheds the constraints of her assigned persona and finds herself rewarded with sincere, sweet love.