Emily's fiance Henry breaks up with her on their wedding day. Pushed by her toxic best friend, Fiona, she agrees to enter a fake marriage with another man, but mistakes William, her mysterious billionaire CEO, for the man she's supposed to marry. After the wedding, William finds out that Emily is one of his employees, while Emily mistakenly believes that William is drowning in debt. William hides his identity till the day of the design competition when Fiona and Henry plot to sabotage Emily.