Who are you in the dark

They meet by chance. He saves her at night when the lunatic tries
to molest her. He had done it out of goodwill little did he know that he wouldn't be able to let go of her. She's just a normal girl but with striking beauty. One thing about him he can't get over his ex and he loves her more than anything else in the world.
He's a billionaire and money to him is not a problem, she wants the money for her sick grandma. He proposes a deal to her and she has to take it cause it's the only way out. will it be worth it or will it just tear her up slowly? What about Elodie? The toxic ex- girlfriend of the billionaire? the girl he has never been able to get over?
But what about the secrets he's keeping from everyone even his ex?