Marrying My Sister's Husband - Episode 6

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?