Poor law school student, Jeong-Hun Han, experiences a time slip via the time roulette machine he accidentally finds at his father's place. When he comes to his senses, he finds himself in the middle of a battlefield during the Joseon dynasty! But before Jeong-Hun can even process what’s happened, he’s approached by a messenger named Jun, who informs him that the only way he can go back to his time period is by completing the time roulette’s mission. Will Jeong-Hun be able to complete his mission and return to his time? (Source: WEBTOONS, edited) Note: chapter count includes 2 side stories