[COMPLETED] Chaeyoung idolized Mina a lot. She likes what Mina loves to do. She's the closest to her heart. Like sister from another mother. But something magical happened. Chaeyoung suddenly turns into Mina. There's two Mina. How will they put everything into place? What if acting like Mina could harm Chaeyoung? What if it remains forever? Where is Chaeyoung? The true Chaeyoung?