You and Sunghoon were best friends for years, but suddenly. Sunghoon has to go on a trip and then got in an car accident. He was in hospital for weeks, and got amnesia. He lost his memories about you, and even the accident that happened to him. That incident was years ago. It when when you were both young. Now, that you both grew up. Sunghoon has still not remembered that you were his best best friend (childhood friend).

One day, you were just taking a view at the balcony, leaning at the railing. And Sunghoon suddenly appeared behind you with a teasing grin, he stood next to you.

Sunghoon: "야~ 너 전에 베프 있었다면서~" ("Hey~ I heard you had an ex-bestfriend~")