
One unexpected encounter with a billionaire leaves her pregnant with twins. His mother is convinced she's the perfect daughter-in-law, so he offers her a one-year contract marriage. It was supposed to be a business deal—nothing more.Too bad falling in love was never part of the agreement.

Su Nian discovers she is pregnant with twins. Haunted by Lu Yanting’s claim that he is infertile and struggling with the financial burden of her sister’s medical bills, she finds herself in a dilemma and even considers terminating the pregnancy. Meanwhile, at the hospital, Old Mrs. Lu learns from a doctor that her son, Lu Yanting, can only conceive with a woman who bears the lucky lotus birthmark. In the hospital hallway, she is overjoyed to discover that Su Nian has the very birthmark she has been searching for for three years. However, upon seeing Su Nian’s pregnancy report, the old lady mistakenly assumes that Su Nian has been abandoned by some heartless man, and proceeds to scold her own son severely without realizing the truth.

Su Nian takes two days off to handle her pregnancy, only to be harassed by her supervisor, Lin Qin, and demoted to a cleaner. When Old Mrs. Lu discovers that Su Nian is carrying the Lu family's heir and bears a lucky birthmark, she becomes convinced that Su Nian is the only one fit to continue the family line. She decides to break Su Nian up with her "scumbag" boyfriend and force her own son, Lu Yanting, to marry her. Meanwhile, the wealthy Lu Yanting, currently enjoying himself at a club, is deeply annoyed by his mother’s constant marriage pressure. As Lu Yanting inspects his hotel, female employees—including Lin Qin—are desperate for a chance to get ahead. Su Nian, working as a cleaner, is assigned to the VIP room 999 where Lu Yanting is staying, bringing the two on the verge of a fated reunion.

Inside a luxurious clubhouse, Lu Yanting, the wealthiest tycoon in Shangjing, is caught in a million-dollar gamble. A crowd of socialites and beauties competes for the chance to roll the dice, hoping to win his favor, even resorting to suggestive banter. Disgusted, Lu shatters a wine glass on the spot. Amidst the chaos, he catches sight of Su Nian, who is busy cleaning nearby. Ignoring the interference of Supervisor Lin, Lu insists that the janitor come over to roll the dice. Forced onto the stage, Su Nian rolls a pair of twos, causing Lu to lose a million dollars and drawing vicious mockery from the socialites. Just as a terrified Su Nian braces for punishment, Lu reveals an unexpected, domineering tenderness. He pulls her into his arms, guides her hands to teach her how to throw the dice, and whispers for her to blow on them for good luck.

Inside the casino, Lu Yanting embraces Su Nian intimately in front of everyone, guiding her hand to roll a winning 12, securing two million. The crowd is stunned that Lu, known for his aversion to women, is so affectionate toward a mere cleaner. In private, Lu Yanting admits to a physical reaction toward Su Nian and demands she spend the night with him just like before. Su Nian firmly refuses, insisting that previous night was an accident to raise money for her sister, and leaves, maintaining her identity as a cleaner. However, Su Nian soon receives a call from the hospital: her sister, Su Xiao, has taken a turn for the worse and urgently needs 200,000 for surgery, leaving Su Nian in a desperate financial crisis.

To save her sister Su Xiao, who urgently needs two hundred thousand for life-saving surgery, Su Nian is left with no choice but to swallow her pride and return to Lu Yanting, the heir to a top-tier wealthy family. Misinterpreting her previous rejection as a game of hard-to-get, Lu Yanting subjects her to relentless humiliation. Desperate for the money, Su Nian humbles herself, offering her own body in exchange for her sister's medical fees. After mocking her cruelly, Lu Yanting forcibly takes her away and sleeps with her, marking the beginning of a high-tension, power-imbalanced contractual relationship between them.

After spending the night with Lu Yanting, Su Nian secures the black card needed for her sister’s surgery and secretly vows that this will be her final compromise. Just as she prepares to leave, Lu Yanting appears and taunts her for being exhausted. During their argument, one of Su Nian's hospital reports accidentally falls, sparking Lu Yanting’s suspicion. Torn between keeping the secret and revealing that he is the father of her child, Su Nian gathers the courage to speak the truth, leaving the story on a suspenseful cliffhanger.

Su Nian intends to confess her pregnancy to Lu Yanting, but is interrupted by a phone call from Lu's mother, who fakes a serious illness. Worried, Lu Yanting rushes away, leaving Su Nian alone and despondent in the room; she is deeply aware of their status gap and feels lost about their future. Upon returning to the Lu residence, Lu Yanting discovers his mother’s deception. She shows him a photo she secretly took at the hospital of a woman with a "lucky birthmark" (who is actually Su Nian) and reveals the secret that Lu Yanting is cursed with "infertility." She insists that only this woman can carry on the Lu family line and strongly urges him to find her.

Desperate to see her grandson, Old Mrs. Lu urges her son, Lu Yanting, to get married, showing him a photo of Su Nian. Lu Yanting coldly refuses, claiming he has no interest and heading back to the office. However, he is triggered by his mother’s comment about him being unable to perform, which sparks a vivid flashback of an intimate kiss with Su Nian. This causes an immediate physical reaction, which his mother catches and teases him about. Embarrassed and infuriated, Lu Yanting orders his assistant, Chen Feng, to find Su Nian immediately. Meanwhile, believing in Su Nian’s lucky aura to bring heirs to the Lu family, Old Mrs. Lu secretly sends her butler to track her down as well. Both parties eventually arrive at the hotel where Su Nian works, leading to an unexpected encounter between Lu Yanting and Su Nian while she is on duty cleaning rooms.

Su Nian, a cleaner at a luxury hotel, experiences physical discomfort due to her pregnancy. Mrs. Lu, Lu Yanting's mother, happens to pass by and offers her help. During their conversation, a self-conscious Su Nian reveals that the child's father is of high status while she is merely a humble worker. Mistakenly believing Su Nian has been abandoned by a scoundrel, Mrs. Lu indignantly suggests she terminate the pregnancy and offers to welcome her as a daughter-in-law, unaware that Su Nian is actually carrying her own son's child. Moved by Mrs. Lu's pragmatic advice, Su Nian decides to go to the hospital for an abortion. Meanwhile, her hotel colleague, Supervisor Lin, and others witness Su Nian getting into a luxury car and accidentally find the ultrasound report she dropped, discovering that she is pregnant with twins.