I know he's out there still, waiting for me. I want to stay by his side even if it's someone else. Because we were meant to be. Because I loved him. And he loved me.

Characters;

Na Ae Ri 

"Like a flower I will grow in your mind, only to wither away."

Ever since she was little, Ae Ri grew up without family or friends. She was depressed and planned to commit suicide. When she was 15 years old, she met Yixing. He was the complete opposite of her and saved her from herself. They fell in love until Yixing died from a tragic car accident. His heart was given to someone else and Ae Ri decides to find out who the new heart owner is. She hopes to find a trace of Yixing in the new owner's heart. The heart that loved her back.

Luhan 

"I couldn't take my eyes off of her. I fell in love but didn't know why. My heart just raced on its own."

Ever since he was little, Luhan had struggled to find a heart donor that perfectly matched to his own. Day after day he grew weaker until a donor was found. Thanks to Yixing, he was able to live and continue his relationship with Song Mi Rae, a childhood friend. His world is turned upside down when he meets Ae Ri and slowly begins a platonic relationship with her. Will that relationship shatter when Ae Ri and Luhan fall in love? Or will Ae Ri's illusion that Yixing is inside of him destroy them both?

Kim Min Seok

"I wonder if I could take back every smile and tear that I shed for you, would I actually do it?"

Yixing and Ae Ri's friend. He was Yixing's childhood friend and also Ae Ri's caretaker whenever Yixing wasn't around. Min Seok had tried to stay away from them once he realized he was in love with Ae Ri. He left them but came back after Yixing's death. He has taken care of Ae Ri since then but refuses to confess until she meets Luhan. Min Seok values his relationship with Ae Ri but will he be able to let her go?

Song Mi Rae

"I've been by your side for a long time. But were you by mine?"

Luhan's friend and lover of several years. They were best friends before deciding to continue into something further. Mi Rae has been by Luhan's side and has taken care of him. Not only is she beautiful, she is also gentle and kind. She becomes good friends with Ae Ri until her relationship with Luhan is threatened.