THE MULTI-MILLIONAIRE'S VIRGIN MISTRESS

Spirited young Megan was only nineteen years old when Alessandro left her. The day her attempt to throw him a surprise birthday party ended in disaster, he chose his work over love. Megan loved him more than anything in the world, but just like that, he dumped her and left for London. Today, seven years later, Megan works as an elementary school teacher at a boarding school. After the school play, Megan is visited by a student's single mother, who's soon joined by her fiance. To Megan's shock, her fiance turns out to be none other than Alessandro! (Source: Renta!) — Description from AniList community (anilist.co).