Thiên Thần Trả Hận, Angels Revenge (2014)

Lee Seon Yoo is training to become a nun. Just before she achieves her dream, she learns that her beloved sister, Jin Yoo, has passed away. Jin Yoo was betrayed and killed by Jang Tae Jung, Seon Yoo's lover. Tae Jung, a smart and handsome man from a humble background, willingly seduced and married the daughter of a powerful "overcome all obstacles" gang boss, as part of his effort to climb the social ladder. Seon Yoo then meets Seo Ji Seok, an immature man from a wealthy family, whose sister, Ji Hee, is married to Tae Jung. Ji Seok faces the risk of losing his family business inheritance to Tae Jung and Ji Hee, as Ji Seok's mother is the second wife of the clan leader. To seek revenge on the man responsible for her sister's death, Seon Yoo gives up her dream of becoming a nun. She marries Ji Seok and becomes Tae Jung's sister-in-law. Thus, Seon Yoo starts living a double life: pretending to be the ideal wife and daughter-in-law in front of the Seo family, and only revealing her true self in front of Tae Jung, showing that she can be as ruthless and wicked as him. Seon Yoo carries her angel wings while hiding a dagger for revenge.