We found out the reason why the MLs started liking Grace, the new woman. She puts something in the bread/desserts and makes them try it, so after a while they show abnormal affection towards her. But for some reason only the FL and the king devil can smell something bad in the dessert.
Chapter 440 contains the chapter 439 actually Chapter 439 (current) is just a reupload of chapter 438. In a sense, it seems chapter 440 is not out yet.
Manga/Manhwa/hua, last panel of the last chapter anyone?
Pretty sure its called Roses and Champagne. Its a good read.