When a miracle is happening to Aeri a college student and idol Taeyeon. They both are changing their soul. How can they handle this situation? Especially when Aeri in Taeyeon body is almost a fangirl of Chanyeol but now she's Taeyeon who is Baekhyun's ex-girlfriend. And it looks like Baek still care about Taeyeon. What will happen to them four? Will they get the right match?