Main characters are both from rich families. They are like strangers living under one roof. Female lead refers to herself as a proud vase and sees nothing wrong with it. There's this one scene where ML is having a business dinner and the other guy is trying to force a girl on him and humiliates her then ML defends the girl. In the end she tries to go after ML even knowing that he's married, but he tells her that she can't even compare to his wife. Their relationship was still like strangers at the time. FL leads sends him a video of her in a new dress mistakenly to the ML prior to this.
I just randomly give a title because I haven't read it but, this book has arranged marriage between two rich families Your Most Faithful Companion