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mc reincarnates as a character in a harem novel where she was adopted by a ducal couple who had a sickly daughter and wanted a companion for their daughter. The daughter was the most beautiful girl in nobility supposedly. There was four guys who loved the duke's daughter and sort of hated and mistreated the mc because they thought she was eager for the duke's daughter to die so she can replace her ( even though the mc and duke's daughter loved each other very much and the duke's daughter was very vocal about how she loves mc the most). Anyway, the daughter died when she was 14/15 and the mc left the duke's house without telling anyone after the funeral because the duke's daughter was the only one she cared about in that house and started to live as a commoner.