Deluded Mate

Drunk, Eun-Seong nearly had sex with his long-time crush, Jeong-Hyeop, but mistakenly believed the person was Jeong-Hyeop's older brother, Jeong-Woo. Jeong-Hyeop, seeing Eun-Seong acting as if nothing happened, falls into another misunderstanding, thinking she likes Jeong-Woo instead... Childhood friends' mutual crushes making a complete mess of things. (Source: MrBlue, translated) *Note: Includes one extra chapters.*