The Way to Protect the King

Read manhwa The Way to Protect the King / I Will Protect My Emperor! / Я защищу императора! / 내가 황제를 지키겠습니다!
Juliet, stuck in a doomed marriage and a deadly political mess, dies too soon. When a college student wakes up as her, she’s determined to return to the real world—until the Duke of Tradis offers a deal: be his fake fiancée.