Seoyeon-Kim didn't expect to be running through the busy streets of Seoul that day. She didn't expect for a handsome stranger to save her from being hit by a car either. After that, things start to change for Seoyeon-Kim. Starting with the fact, the handsome stranger now wants her to tell him how she has been every day. Not to mention that she sees him more than ever after meeting him.

Who is this handsome stranger and why does she have the feeling that they should run together to somewhere to be alone?