Female isekai, reincarnated

Sisters Ju-eun and Hyejin grew up in absolute poverty. After their mother’s death, Hyejin accepts the offer to join their estranged father’s wealthy family. But when Hyejin turns out dead just three years later, Ju-eun is grief-stricken. She grabs at the chance to travel back in time and take her sister’s place where she meets the kind but mysterious Iho.