Mailboy Do Kyungsoo delivers a certain parcel to an apartment along Gangnam-Do. It's the boy that promptly exits the metallic fence to receive the parcel from Kyungsoo staring at the recipient's hazel locks and chiselled features had his heart doing a complete somersault. Smitten by attraction, Kyungsoo decides to take the first step.

Within seconds, Kim Taehyung has successfully driven her away. But he comes back after a long time to see that everything has changed. There was nothing else he could do.