This crossover is between Ex Girlfriend's club and The Heirs. This especially features Kim Soo Jin (Song Ji Hyo) from Ex Girlfriend's Club and Kim Won (Choi Jin Hyuk) from The Heirs. What will happen when they have to work together, to make sure they achieve their goal. And will the fake relationship they get into together be discovered, putting them at risk? Especially by Kim Won's father? Or will they succeed?