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Marrying My Sister's Husband Full Episode
001
After the sudden death of her younger sister Yu-Ri, Yu-Jin wakes up to find herself reincarnated before Yu-Ri's marriage to Chan-Yeong, the heir of Young Glory Holdings. Haunted by guilt for letting her sister marry Chan-Yeong, Yu-Jin confronts him, demanding to make him suffer the pain she endured. In a tense confrontation, she claims she will expose her own murderer and insists that Chan-Yeong must marry her instead of Yu-Ri, challenging their destined relationship and setting the stage for a turbulent shift in their futures.
002
During their honeymoon planning, Chan-Yeong and another character debate travel destinations, revealing underlying tensions. A woman, suspicious of Chan-Yeong's inappropriate behavior after marriage, confronts him, accusing him of hitting on her despite being married to her sister Yu-Jin. She challenges him to marry her instead, claiming it would be more exciting. Chan-Yeong provocatively promises a thrilling experience, escalating the conflict. The episode ends with his unsettling vow to make things chaotic, leaving the situation unresolved and hinting at further turmoil ahead.
003
Yu-Jin shocks her sister Yu-Ri by announcing her engagement to Chan-Yeong, despite them lacking romantic love, explaining the marriage is for the company’s benefit and her own interest. Yu-Ri warns Yu-Jin that marrying Chan-Yeong will cause her humiliation and pain, but Yu-Jin insists she will handle it. On their first night, Yu-Jin and Chan-Yeong sign a strict marriage contract to protect company assets and prevent property division after divorce or death, treating their union like a business merger. Yu-Ri questions the formality and urges them to consider a real marriage rather than a sham, leaving their true relationship uncertain.
004
Ju-Hui delivers requested bedding to a woman, setting a seemingly calm scene that quickly turns tense. The woman hints at having unexpected tastes, suggesting hidden motives as she invites Ju-Hui to stay and offers wine. Despite the woman’s subtle advances, Ju-Hui resists, reaffirming his loyalty by saying, "You know that you're my only one, Ju-Hui." The woman then reveals a deeper plan, explaining she called Ju-Hui ahead because she’s about to "take action." The episode ends with an ominous sense of impending confrontation, leaving Ju-Hui caught in an uncertain and possibly dangerous situation.
005
In this episode, Chan-Yeong and Ju-Hui, former lovers now living under tense circumstances, quietly navigate their hidden relationship while maintaining appearances. After Chan-Yeong marries Yu-Jin, his sister, he controversially hires Ju-Hui as a housekeeper, intensifying the complicated situation. They share secret moments, carefully avoiding detection by Yu-Jin, who is asleep. Ju-Hui struggles with household duties due to an injured hand, prompting Chan-Yeong to urge her to prioritize healing over chores. The episode ends with an unexpected visitor arriving late at night, leaving their precarious secret vulnerable to exposure.
006
Yu-Jin arrives at her sister's home, fearful and alone after their parents' death and the sister's marriage. She asks if she can stay, revealing she was imprisoned by Chan-Yeong and Ju-Hui, who confiscated her phone to block contact with her sister. Despite the tension, the family agrees to let Yu-Jin stay in an empty room. Ju-Hui is instructed to prepare the guest room, but unease grows as Yu-Ri vows to protect Yu-Jin. The episode ends with a flashback claiming Yu-Jin died due to harassment from Chan-Yeong and Ju-Hui, raising the question: if not them, then who killed her?
007
Yu-Ri faces a painful breakup when Tae-O tells her to delete him from her life as he plans to marry Chan-Yeong Ha for business reasons, but Yu-Jin marries instead. Tae-O then leaves for America without contacting Yu-Ri. In the present, Yu-Ri's current marriage lacks love, and Tae-O asks if she is happy, saying he will leave if she is. The episode ends with Tae-O questioning Yu-Ri, hinting at a possible shift in their relationship as he asks if she wants to become a real couple.
008
In this episode, a man and a woman confront their complicated feelings as he struggles to hate her but cannot forget her. He offers to stay by her side until he eventually grows resentful, proposing they start this difficult relationship tomorrow. Meanwhile, the woman, Yu-Ri, declares she is leaving for good, ending their meetings. As he ponders why she returned now, a shocking detail emerges: her sister is seen wearing his clothes, raising new questions. The episode ends on this mysterious note, leaving their future and the sister's involvement unclear.
009
Yu-Jin confronts Yu-Ri upon discovering Yu-Ri's feelings for Chan-Yeong, who is Yu-Jin's husband, intensifying the complex love triangle. Yu-Ri admits she loves Chan-Yeong despite not having fully committed to marriage rites and insists on marrying him. Yu-Jin reluctantly accepts this betrayal but demands compensation, offering Yu-Ri an acceptance letter to the British Royal Ballet School to leave Korea. Yu-Ri’s passion for ballet clashes with her new marriage, given past injuries caused by Chan-Yeong and Ju-Hui that damaged her legs. The episode ends with Yu-Jin resenting both women as rivals for Chan-Yeong's love, escalating the personal conflict.
010
Yu-Jin is murdered by her husband Chan-Yeong and his mistress Na Ju-Hui. Days later, her sister Yu-Ri is killed and wakes up back in time before Yu-Jin and Chan-Yeong’s wedding. Armed with the knowledge of betrayal and a vow to avenge her sister, Yu-Ri decides to marry Chan-Yeong to uncover the truth and punish him. She steps into the role of bride, masking rage beneath practiced smiles as suspicion closes in. When her first love Tae-O suddenly returns, Yu-Ri faces a brutal choice between revenge and the fragile chance at regained happiness. Every move risks exposing her, and repeating the tragedy she is desperate to stop.