Married With The Playboy Billionaire

Natasha is just a simple and ordinary girl while Alexander is a playboy billionaire CEO because since his ex-girlfriend left him he never got into a serious relationship since then.
One night, Alexander went to the bar with his friends and he met Natasha there and he got interested in her because she looks like his ex-girlfriend and they drink together.
They got drunk and they had a one night stand but Natasha did not remember who was the man who took her virginity.
Natasha applied at the Montilva Corporation as the secretary of the CEO and later she found out that her boss is the same man whom she had a one night stand with before.
Natasha's mother got sick and they need a huge amount of money to pay her bills at the hospital so Natasha has to look for money and it happened that Alexander needs to find a wife as soon as possible for his inheritance and he offered Natasha a contract marriage in exchange of money and Natasha has no choice but to accept the offer.
Is there a chance for them to fall in love with each other and make their contract marriage a real one? Or someone will come back from the past and ruin their relationship.