[Inter-floor Noise Short Story Collection] To My Hated Younger Sibling

'''Introduction to the Work: An 'anomaly' has taken possession of the body of his dead younger brother, Seo Ji-woo, who was obsessed with him. The 'anomaly' proposes that if Do-hyun has relations with it four times, it will leave this body. Crumbling under the terror and hatred toward his brother and this unknown entity, as well as his longing for family...'''