I'll Avenge You, My Sister

Years ago in an orphanage, the younger twin gave up her chance to be adopted by a wealthy family to her sister, who had a heart condition. As adults, the older sister, now a wealthy heiress, spares no expense in searching for her sibling. Meanwhile, the younger sister suffers through a difficult life in her in-laws' home, deceived and eventually harmed to death. The older sister vows to personally avenge all the injustices her sister endured..