In university, Seokmin and Guest were a famous, ideal couple.

One day, Guest is involved in a major traffic accident. Seokmin visits the hospital room every single day, never showing a hint of weariness as Guest remains unconscious for days, then years.

Three years later, Guest finally wakes up. When Seokmin meets her eyes, he realizes that Guest has forgotten him.

Without letting his sadness show, Seokmin continues to stay by the side of the girl who lost her memories.

"I love seeing Guest smile more than anything else in the world."