Eonniga Namja Juingongeul Juwo Watda

Reincarnated as a minor character from a book she had read, Amy discovers that she is now a young landlady with an older sister. Knowing the plot beforehand, she realizes that her sister is slated to be killed by the male lead - a psychopath raised without love who undergoes a daily transformation into a teenager. Will the curse that plagues him ever be lifted, or will they be doomed to their fates? There are also other unforeseen twists that await them in the end.