Ahra and Chang Kyun are a best damn friend since 4 years ago. Chang Kyun assume Ahra as his sister and Ahra assume Chang Kyun as her brother. There's no secret between them. They must tell their story to each other. From A until Z. "Marry you ?! That's a NO ! Double NO ! Forever NO !" - Ahra "Please, I'm asking you a favor." - Chang Kyun Will Ahra accept Chang Kyun ? If yes, can they fall in love with each other ?