I Hold the Tyrant's Heart

While being reborn into a loving noble family with powerful elven blood certainly isn't a bad fate, Eucenielle can't forget the people she left behind in her previous life. All she wants is to return to her original world, but things get complicated when the crybaby crown prince, Tes, falls head-over-heels for her. Once they reunite as adults, Eucenielle is disturbed by the drastic change in Tes' looks and personality, which everyone else seems oddly oblivious to. Though she has a feeling Tes resorted to dark measures to win her heart, Eucenielle finds herself being drawn to the tyrant regardless...

(Source: Tappytoon)