Joo Hyun and Seung Wan were childhood friends who promised to fulfill their dreams together. Seung Wan had to leave, and Joo Hyun became the singer, 'Irene' on her own, impatient for her friend to return. When Seung Wan comes back to Korea, Joo Hyun has changed a lot.

Not to be confused with "Friends With Benefits," Seulgi and Irene are friends with boyfriends... who still fall for each other anyway. 

A story of two girls; one knew who she was from the beginning while the other had no idea who she was from the start. It was all a matter of time, space, intuition and destiny. It never had to do with love. It couldn't possibly exist with just love itself. She knew it was impossible, she never thought of what could be. A girl with optimism gets her own beliefs thrown back at her from one clueless girl, who makes her want to stop believing.

Red Velvet just debuted. Do you wonder what happens in their dorm? The four girls share a deep friendship with some hidden feelings in between. The roommates Seulgi and Joy plan to get the two together. Will their plan work?