Look-Alike Daughter is a Manga/Manhwa/Manhua in (English/Raw) language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

"I think my mother is a killer." Gil So-Myeong, who has excellent grades, good manners, and an exemplary child, has lived as a perfect daughter according to the standards her mother demanded. However on the day that his younger brother rises from the river as a corpse, a terrifying suspicion rises in So-Myeong's mind. A cruel mother-daughter thriller between a mother who tries to get rid of everything that interferes with her child's life and a daughter who tries to escape from her!