New York, May 2011.

Today is so warm that you can feel summer approaching. Birds are singing happily, encouraging people to take a walk.

A teenager stops in front of the tracks, looking at a girl on the other side of the rails. For a moment their gazes meet, but this magical moment is spoiled by the appearance of a train. He is mesmerized by her beauty. He can't take his eyes off her as she runs across the street. Her hair glistens in the sunlight, and it seems to him that the world ceases to exist for him the moment she stops next to him and turns her face toward him.

She smiles fleetingly.

— We will meet soon, handsome — she announces, measuring him with her eyes.

The boy doesn't understand her words even then, especially since she just so simply turns on her heel and walks away.

A month later, he realizes that she knew him from a photo. She knew he was the son of the man who was going to marry her mother in the future.

Jin officially meets her in June, at a dinner prepared by their parents, who admit that they have been dating for more than six months and soon intend to live together.

That evening begins their story, which will have a tragic ending in the future…