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Episode 1 - I Married My Sister’s Husband

A contract marriage, a switched groom, and a night that changes everything. She steps into the wrong life—and finds the right heartbeat. Maybe love was never part of the plan… or maybe it was.

Episode 2 - I Married My Sister’s Husband

This episode tells the story of two newlywed couples who, due to a mix-up, spend their wedding night with the "wrong" partners. In Villa No. 3, the stern CEO Fu Chengzhou discovers that the bride, Su Wan, is not the decisive Su Qing from the rumors. However, on a stormy, power-outage night, he feels pity for her and begins a gentle courtship. Meanwhile, in Villa No. 8, Fu Yang thought his bride would be the little sister he met ten years ago, but instead, he encounters the mature and alluring Su Qing. In her drunken state, Su Qing questions Fu Yang's "abilities," igniting his competitive spirit. Two marriages with misplaced identities begin on their wedding night, filled with both conflict and ambiguity.

Episode 3 - I Married My Sister’s Husband

After their wedding night, the Fu brothers, Fu Chengzhou and Fu Yang, realize the women by their sides are not their intended partners. Fu Yang, expecting to marry the "sweet girl" Su Wan, wakes up to find a woman with a cold demeanor and short hair next to him (who is actually her sister, Su Qing). Meanwhile, the elder brother Fu Chengzhou spends the night with the long-haired Su Wan. In the morning, both newlyweds awaken amidst a struggle between tradition and rebellion. A misplaced phone call finally makes the four of them realize they've "married the wrong person on the wedding night," with the two sisters and two brothers completely swapped, plunging the situation into chaos.

Episode 4 - I Married My Sister’s Husband

Su Wan and Fu Chengzhou spent the night together due to a misunderstanding. In the morning, Fu Chengzhou asks Su Wan to get dressed to welcome Su Qing and Fu Yang. Su Wan, feeling sore, playfully asks Fu Chengzhou to get her clothes. Though gruff, Fu Chengzhou complies with care, even carrying her out of the room without her shoes. After Su Qing arrives, they discuss the reason for the mix-up: heavy rain obscured the house numbers for buildings 3 and 8, leading Su Wan to mistake Fu Chengzhou for Fu Yang. Facing this turn of events, Su Qing, to protect her sister, proposes to go along with the mistake and proceed with the arranged marriage swap.

Episode 5 - I Married My Sister’s Husband

To save face and maximize profit, the eldest daughter of the Su family, Su Qing, decisively proposes an exchange of engagements. Her younger sister, Su Wan, will marry Fu Chengzhou, the eldest son of the Fu family, while Su Qing herself will marry Fu Yang. Fu Chengzhou quickly agrees, driven by business rationality and family interests. Fu Yang initially strongly objects, but instantly compromises when Su Qing uses "last night's passion" as leverage. Before leaving, Fu Yang teases his brother Fu Chengzhou, calling him an "old bull eating tender grass." Subsequently, Su Wan begins to try and please Fu Chengzhou in her role as a "little wife," changing her address from "husband" to "Brother Fu." Although Fu Chengzhou is unaccustomed to such intimacy, he develops an initial impression of his wife, who appears delicate and affectionate but is surprisingly strong, as "somewhat obedient."

Episode 6 - I Married My Sister’s Husband

Su Wan arrives on time as agreed to be picked up by Fu Chengzhou, and the couple begins their formal post-marital cohabitation. On the way to the Fu family's residence, Fu Chengzhou acts extremely rigid and indifferent, not only complaining about Su Wan being noisy but also setting strict rules like "no eating in the car." However, Su Wan is not as fragile as she appears. She not only retorts to Fu Chengzhou but also thoughtfully prepares a packed breakfast for him, stirring an unusual feeling in Fu Chengzhou. Fu Chengzhou then proposes a formal "pre-nuptial agreement," defining their relationship as a commercial marriage and stipulating two sessions of conjugal life per week. Su Wan boldly jokes about the "seven times a night" trope from novels, leaving Fu Chengzhou speechless. Upon arrival, Fu Chengzhou sheds his cold demeanor, forcefully kisses her in the car, and, using the excuse of "fulfilling the agreement," reveals his domineering side.

Episode 7 - I Married My Sister’s Husband

This episode showcases the extremely rational CEO life of Su Qing, the head of Su Group. Fu Yang, her celebrity husband, feels guilty for hurting Su Qing's knee with his overzealous actions last night and specially brings medicine to her office. However, Su Qing has completely digitized and timed her emotional and physical needs. After precisely calculating a meeting gap, she proposes "marital activities" in the office. Afterward, Su Qing coldly criticizes Fu Yang for only lasting 20 minutes, deeming him "inefficient" and stating it coincidentally aligned with her plan. She even announces that future marital arrangements will be handled by her secretary. Fu Yang is deeply affected and tries to regain his virility to prove himself, but Su Qing ruthlessly rejects him due to an urgent work matter.

Episode 8 - I Married My Sister’s Husband

This episode recounts the interactions between Su Wan and Fu Chengzhou after their intimate encounter, as they return to the villa. Due to exhaustion, Su Wan "accuses" Fu Chengzhou in the car, complaining that he, who normally appears abstinent, is actually insatiable. Fu Chengzhou, in a teasing manner, displays his dominant side. Afterwards, Fu Chengzhou carries Su Wan back to the bedroom, and the two have another minor dispute over changing into pajamas. Su Wan checks her phone messages while exhausted. The episode concludes in a quiet atmosphere with Su Wan talking to herself, showcasing the everyday and slightly sweet and doting side of a wealthy couple's life.

Episode 9 - I Married My Sister’s Husband

In the study late at night, Su Wan sees Fu Chengzhou working as hard as her sister Su Qing, feeling pity but speaking harshly. Su Wan brings water to take care of him, while Fu Chengzhou, in a proud manner, takes out Su Wan's favorite cake, falsely claiming it was "bought on the way" to test her. Su Wan sees through this, realizing it's Fu Chengzhou's specially prepared apology gift, and her mood brightens. She playfully indicates her willingness to forgive him. However, just as the atmosphere becomes intimate, Fu Chengzhou's comment "You've gained weight" instantly triggers her anger, causing Su Wan to storm off and their relationship to fall into another "stalemate."

Episode 10 - I Married My Sister’s Husband

On the second night after their wedding, Fu Chengzhou returned to the room and adopted a "dean of students" persona towards Su Wan, who was curled up by the bed. He sarcastically pointed out her unhealthy sleeping posture. Su Wan was upset because Fu Chengzhou had previously called her "fat," but Fu Chengzhou rationally calculated her BMI as 17, indicating she was underweight, and pulled her into his arms. The next morning, Su Wan called her sister Su Qing, but it was Fu Yang, who was still in bed, who answered. Su Wan, improvising, used Fu Chengzhou's tone to lecture Fu Yang and exerted pressure as his "sister-in-law," showcasing the fun and role changes of their newlywed life.

Episode 11 - I Married My Sister’s Husband

The day after Su Wan and Fu Chengzhou's wedding, Su Wan discovers Fu Chengzhou in the room while she's changing, leading to a logically rigorous debate about "peeking." Afterwards, Su Wan attempts to get a kiss, but Fu Chengzhou refuses, claiming he hasn't brushed his teeth, sparking playful banter. To apologize, Fu Chengzhou demonstrates his eidetic memory, styling Su Wan's hair beautifully after just one glance at a tutorial. Before leaving, Fu Chengzhou warns Su Wan to behave herself upon returning to the Fu family residence, mischievously threatening to increase the frequency of their "newlywed duties" as a consequence. Su Wan retorts that he's essentially rewarding himself.

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