During the filming of his latest drama "Nice Guy", the famous actor Song Joong Ki, felt in love of his co-star, Moon Chae Won. He tried to win her heart and after some time they became a couple but because of their tight schedule, they barely saw each other and in addition of the little time they passed together, he always felt like she had a wall that couldn't let him in to her heart.

Moon Chae Won didn't know exactly why she left her guard down; she never felt the necessity of having a relationship, she was afraid of having one, being in love with someone, was one of the scariest thing, the way you can get hurt because of love. Being in love was a risk she wasn’t willing to take, that was until she met Song Joong Ki, she didn’t notice when she was falling in love with him, the moment she notice that, she couldn’t help being afraid of losing control and run away.

One year later, they meet again in a party; since they broke up they haven’t seen each other.

Do they still have feelings for each other? Can they break the boundaries that keep them apart? Would MCW give a chance to love?