Lin Tian descends from the mountains and enters the city, intending to find his fiancée, whom he has never met, and call off their engagement. However, an unexpected incident brings him into contact with Su Wanrou, the president of Su Group. To his surprise, Su Wanrou turns out to be the very woman he is engaged to marry. To fulfill their agreement, Lin Tian becomes her personal bodyguard for three months. As they spend time together, they face various challenges in business and everyday life, and their relationship gradually develops from unfamiliarity into an effortless understanding. Meanwhile, Lin Tian's long-hidden past and true identity slowly come to light. As the three-month deadline approaches, the two people who originally wanted nothing more than to end their engagement begin to reconsider their feelings for each other.