15 Days (Short Story) Explanation :
The story starts by Seonghwa being home alone. At first it was okay, nothing much happened. Then there comes the next few days, where things start to get weird. As he continues to write in his diary, an uneasy feeling bothered him a lot. In the end, the family didn't come home, which was weird enough. Then he heard a knock, went to the door, only to be startled by his cat, who died years ago and he just realized now. As soon as the second knock comes, he remembered the paper that has "3" written on it. He rushed to go get it and tried to figure it out. As soon as he figured it out, it was too late. He was already captured. In the end where Seonghwa is playing a video game, it's not really him, but rather he's an imposter who captured Seonghwa and took his place. All this time, the real Seonghwa was part of a game, while the imposter was the one playing.