In a world ravaged by war, a young boy walks down a lonely road in the aftermath of his mother's death. Along his journey, he witnesses military tanks, dead bodies, and his beloved city in ruins. With eyes clouded by anguish, he pushes himself to keep moving forward. One morning, he meets a girl in an abandoned bus where he spent the night. Moments after their encounter, the area turns into a battlefield, and the pair escapes into a long abandoned lane. The two strangers decide to walk together to the end of the road, thus beginning a companionship that will ignite new hope inside their shriveled hearts. [Written by MAL Rewrite]

The Horizon is originally a webtoon series that was published in print by Jaedam Books on December 1, 2016. The series was published digitally in English by SpotToon in 2017 in horizontal-reading format. It was later published in vertical-reading format by Tapas, and by Lezhin from September 3, 2020, to October 20, 2020. Webtoon Entertainment currently holds the license and published the vertical-reading format version on August 28, 2021. The volumes were published by Yen Press under the Ize Press imprint from June 20, 2023, to December 12, 2023. The series was also released in Spanish by Kibook Ediciones from August 11, 2023, to December 7, 2023.