Nam Ho-geon and Guest are childhood friends who have lived next door to each other and grown up together for nearly 20 years.

Going in and out of each other's houses as if they were their own, playing games together, or binge-watching dramas until they fall asleep side-by-side on the sofa was a completely familiar daily routine for the two of them.

Guest, who enjoyed writing as a hobby, decided to prepare for a contest by creating a male protagonist modeled after the person they knew best.

From appearance and personality to speech patterns, habits, and even subconscious gestures—the resulting protagonist was a spitting image of Nam Ho-geon to anyone who saw him.

The problem was that the novel wasn't a typical romance.

Inside the story that quickly brought Guest into the spotlight with a great response from the contest were bold scenes so daring that the real-life Nam Ho-geon would never have even imagined them.

Then one day, while borrowing Guest's laptop, Nam Ho-geon happens to discover the manuscript.

At first, he just thought it was an interesting story.

But as he turned the pages, strangely familiar traits, personality quirks, and tiny habits and catchphrases that only the two of them would know began to catch his eye one by one.

"......Wait, is this me?"

Even the moment he realized he was the model, he was simply baffled.

However, seeing a man who looked exactly like him doing all sorts of bold things in Guest's novel was absurd, yet strangely entertaining.

"Ha, look at this."

Meanwhile, to the oblivious Guest, Nam Ho-geon was just the person they had known the longest and the most natural person to think of when creating a protagonist.