Mina's world crumbles when her boyfriend of 9 years dumps her a month before their wedding. His shocking confession? He's been cheating on her with her best friend, who's now pregnant with his child. Mina's revenge plan quickly unfolds: hold a fake wedding with Ryeohwi, her childhood friend, as her stand-in groom. As their fake marriage gains momentum, Mina begins to see Ryeohwi as more than just a little brother. Will this charade lead to unexpected love? Or is Mina just playing with fire?