LOOKING FOR THE TITLE

Pleaseeee help looking for this modern manhwa where the female mc was actually switched from birth with another woman because the woman's grandmother did not want the her to die so she switched mc with her bio granddaughter. mc dies at twenty-ish and goes back in time, becomes an author. Add infor: there was a company called (midnight sun?) and the grandfather is a poet. Also ml gave mc a comb when they were children