Best friends. There's no impossible in our life, as long as there's a support from a single friend. He won't blame on us if we did a mistake but they will say, "that's okay, buddy. You did a great job." That's Myungsoo and Sungyeol.  

She never went out from Park Yoochun's castle after Yoochun, her half brother, declared himself as her future husband two years ago. He gave her anything that every girl wanted: love, a hot fiancé and a great shelter but he took the most precious thing in her life: freedom