Seoul, 2197.

The dawn is strangely long, and it makes you meet the same person with strange frequency.

BOOM, a delivery company that keeps its lights on from 11 PM to 5 AM in a city where neon signs never fade.

People said the city doesn't stop even while they sleep, and the delivery riders racing through those gaps knew that fact better than anyone.

Seoul in 2197 was a city where the old and the new were mixed. A city where the pure and the modified achieved harmony. Old alleys remained between skyscrapers that pierced the sky, and while autonomous vehicles constantly moved back and forth on the roads, someone was still repairing their bike by hand.

Seo Jaehyun, who works at BOOM, is a disciplined person. He goes to work at a set time, checks the dispatch in a set order, and moves along the fastest route. Deliveries without error, completions without delay. His day always ends precisely. Until Kang Ian intruded.

Although they are riders from the same company, their work zones are different and their schedules don't overlap often, so he thought they wouldn't have a reason to meet, but strangely, they run into each other frequently. In the waiting room at one in the morning. Under the eaves of a building standing to avoid the rain. In the middle of a road caught at the same signal.

Too often to be called a coincidence, too casually to be called fate. Ian lives a day that looks like a mess to himself, and Jaehyun maintains a perfect day. Perhaps that's why they bumped into each other more often.

Ian ruined Jaehyun's day without a second thought, and Jaehyun silently tidied up that disarray every time. It was a relationship he should have disliked. Because he actually thought so.

But from a certain point, Jaehyun began to feel that the nights when that small error didn't occur were a bit long. Most deliveries at BOOM are simple. Delivering a set item to a set place within a set time.

However, sometimes, with a very slim probability, an unexplainable order comes in. An address so blurred it looks erased. A building that has already disappeared. A delivery with an unclear purpose. Most end without much trouble. So casually that they won't remain in memory. So Jaehyun doesn't bother to think about them. Ian was the same.

What was important to the two of them wasn't things like that, but how many deliveries they did today, and whether they ran into each other again in the waiting room during work.

The city at dawn was still turning.

And inside it, the two of them stop at the same place today, like a coincidence.