The Wedding With Mr. CEO

"Alex was betrayed by his childhood sweetheart and cousin, which caused him to go abroad to heal his heart. Resulting from the pressure of his family, he needed to make a deal with a stranger.
He made a deal with a woman he met with the condition of becoming husband and wife within papers. Meanwhile, Diane needed money desperately leading her to accept the deal without thinking further.
Well, who wouldn't? She'll just marry a striking man in exchange for getting loads of money, more than when she was just a mere cashier.
Just a couple of hours after they first met, Diane and Alex were husband and wife. Striving to fulfill her responsibilities, until when can Diane keep up with the man? Will their contracted marriage turn into a real marriage?
And, if it does, what happens if a big blast blows everything apart?