On the very first day of Jiang Tang's return to China, she accidentally smashed a priceless vase belonging to Mu Zhiqing, a legend in the business world, and also bumped into his cold, self-contained world. Through a contract marriage, she became his 'tool person' to deal with family disputes, little knowing that the ascetic husband who spent day and night with her was actually the 'big brother' to whom she had confided her innermost thoughts and feelings for seventeen years! While using his identity as a husband to gently open up her defenses, Mu Zhiqing couldn't help feeling jealous of his own 'avatar'. When Jiang Tang gradually suspected through various clues that the person by her side was none other than the boy in black from back then, an accident abruptly uncovered the truth.