Beneath the glittering serenity of Seoul, there lives a young man named Lee Sung-Ho—the heir to a billionaire family whose life appears perfect from the outside.

Handsome, intelligent, charismatic, and raised in a prominent family, Sung-Ho seems to have it all. But underneath it all, he just wants to live like an ordinary person—go to college, walk home, and enjoy the world beyond the shadow of his family's power.

That day, the afternoon sky was a soft blush as Sung-Ho decided to drive home without a personal driver. He wanted to feel the fresh air—his steps relaxed, his mind at ease.

Until fate struck him... literally.

A sound of laughter and cheerful footsteps could be heard in the distance. A group of girls in high school uniforms were running playfully, playing a silly teenage game: “Truth or Dare.”

And before Sung-Ho could escape, a girl suddenly ran toward him—and... kissed him.

Silence. Time seemed to stop.

Sung-Ho could only stand frozen, his eyes wide, as the girl glanced at him—her face innocent, young, and clearly not someone he knew—and then ran away, her friends laughing.

For the girl, it might have been just a game.

But for Sung-Ho... it was the beginning of something strange. Something that made his heart beat erratically.

And who would have thought... a few hours later, fate would bring them together again—not on the street, but at his friend's house.

The girl who accidentally kissed him... turned out to be his best friend's sister.

From that day on, Sung-Ho's previously calm and orderly world... began to fall apart in the sweetest way.