The Girl Next Door 2.

Her husband Sejin is not interested in his wife Ahae as a woman. Ahae's husband is just heartless. In fact, Sejin is having an affair with Ara's young and beautiful younger brother Ara. After having suffered from depression due to work poisoning, he receives a message from the alumni association, and he changes his mind and attends. There, she meets Ahae, the next-door sister who had a crush on her childhood, and is still fantastic with her pretty appearance. Lonely Aha due to the innocence of her husband and Gunhoo approaching her with counseling. As if they were aware of each other's loneliness, they are attracted to each other and spend one night, returning to each other's daily lives, but after forgetting about the Ahae, the hand of the Ahae Abandonment comes to mind all night. Will they be able to go back to their daily lives?