THE RICH MAN'S RELUCTANT MISTRESS

Up-and-coming interior designer Lucinda is dumped by her fiance and develops a mistrust of men. When she gets a job offer to renovate a luxurious mansion on the island of Saint Lucia in the Caribbean Sea, it's a dream come true! But there's a problem with her employer. It's Zane Alexander?a man for whom she once had feelings! He's the last person in the world she wants to be around right now. But as soon as they arrive at the island, he invites her to spend her time there as a vacation...with him. (Source: Renta!) — Description from AniList community (anilist.co).