Hiding his identity as the founder of Taesung Bio Group, Park Chang-wook lives as a hotel janitor — until a fateful encounter with Jeong Se-yeon, CEO of Jeongseong Group, whose daughter he saves, leads to a contract marriage. What follows is the story of how he strips power from the family who looked down on him and the arrogant businesspeople who abused it, and reclaims both true love and his family's honor.