I Married My Sister's Husband

My younger sister Yujin is dead. And it was her husband Ha Chanyoung and his mistress Na Juhee who did it. I had only just learned the truth when I, Yuri, was killed too. When I opened my eyes again, I had gone back in time to before Yujin and Chanyoung were married. Vowing to avenge her sister, Yuri goes through with marrying Chanyoung in her sister's place. Then a man appears before her... none other than Yujin's lost first love, Taeo.