

After their parents passed away, Tonia Hays and her sister Lena lived together. To avoid burdening Lena, Tonia agreed to go on a blind date with Yandel Zane, the grandson of Lady Zane, whom she had unexpectedly saved. When they first met, Yandel thought Tonia was a gold digger. So he hid his identity as the richest man and the Zane Group's CEO, pretended to be poor, and married her immediately. Later, they had many amusing incidents as they got to know each other, and he gradually fell for her. He fiercely defended her at a banquet and dealt with her vicious relatives.They became closer, but due to some misunderstandings, they signed a one-year marriage contract.Because of his love rival and a rich young lady, Yandel's identity nearly got exposed. After many twists and turns, he realized his true feelings and wanted to get Tonia back. She also gradually became dependent on him. Eventually, through misunderstandings and protection, this contractual marriage changed into a real one.

In the fog-choked steam city of Verlock, Chloe Ashborne survives a brutal family massacre and hides herself as a disfigured, mute maid sneaking into the obsidian Clock Tower Manor—the stronghold of the cold and powerful Duke Liam. Covered in wax scars and pretending to be timid and clumsy, she hides her true identity as the last heir of the Ashborne mechanical clan, a master toxic healer, top gear decoder, and deadly combat fighter. Her only goal is to retrieve the sealed case files that record the truth of her family's murder from the manor's confidential machine room. As she lurks in the shadows, she repeatedly arouses Liam's suspicion and curiosity. She narrowly escapes frame-up and fatal traps set by the jealous captain of the female guards, saves Liam from fatal steam poison and assassin attacks, and secretly controls the manor's defense gear system in crisis. While the line between hatred and attraction blurs, Chloe's layered disguises are gradually stripped away one by one. When she finally breaks into the secret chamber to obtain the files, she falls into a carefully laid trap, and her true face and identity are completely exposed to Liam. The two fall into misunderstanding and confrontation, until the real murderer behind the massacre launches a full-scale attack on Clock Tower. Standing amid fire, gunsmoke and collapsing steam machinery, Chloe and Liam lay down their hatred, fight side by side to defeat the evil guild, uncover the buried truth, and turn a revenge disguise into a fated love bonded by gears, steam and redemption.