Accidental Mark Has your dynamics but it's a crime bl novel: swallowing the sea/silent reading (not president but rich)
My husband is suffering from a terminal illness I think this one is similar to what you're looking for
I became popular after online dating with a big shot Married the scum gong's villain brother More Than a Few Blessings Rebirth of a cannon fodder from a novel Rebirth of a movie star Rebirth of the golden marriage Rebirth of the wolffish silkpants bottom