Read Married Woman hentai manga on hentaidexy,
summary for Married Woman :
Joo-wan is a college student who lives with his girlfriend Hyun-joo who’s five years older than him. One day, Sun-ae, a friend of his girlfriend, comes to their house and drinks with them. It was from that day on that Joo-wan starts to fall for Sun-ae, and he becomes less and less concerned with Hyun-joo while he begins to covet Sun-ae.