Two Mothers (뻐꾸기 둥지 / Bbeoggoogi Doongji)

A revenge tragedy of a woman called Hwa Young who tries to bring Yun Hee down. Hwa Young thinks Yun Hee, her brother's ex-girlfriend, is responsible for her brother's death. She plans her revenge on Yun Hee, who becomes infertile, by being a surrogate mother for her and taking the baby from her.