Im Seongsun debuted in 2010 with his book Consultant, for which he received the Segye Literary Award. His other novels include Mun Geunyeong Is Dangerous, On the Contrary Amicable People Live Here, At the Extreme, The Book of Self-Improvement, and Ouroboros. He also published a collection of his essays, Obsoletely, Uselessly. In 2018, he received the ninth Young Writer’s Award for his short story “A Flock of Sheep Roaming the Corridor and Their Predators.”