THE SUBSTITUTE TAKES REVENGE: THE HUSBAND'S MISTAKE IN DECEIVING HIS WIFE

Haruka is married to Shoji, a kind and wealthy man, and while she dreams of having children, she enjoys her life as a housewife, though it sometimes leaves her feeling bored. One evening, Shoji goes out for drinks with friends, but something feels off...he seems to be hiding something. Haruka begins to suspect he may be having an affair. Unable to shake her doubts, she starts digging and uncovers a shocking revelation. Could her entire marriage have been a lie all along? (Source: MangaPlaza) — Description from AniList community (anilist.co).