Convenient Arrangement

Jack Smith is an Orphan who is incredibly smart. He was adopted by a rich British family and he went on to become a protégée in Law.
After he become an escape goat when the first lost their biggest client, he had to quickly find another job and he got contracted by a consultancy firm. On one of his first assignments he meets Joe, an owner of international, multi-billion dollar pharmaceutical company.
Joe needs some help getting rid of an annoying model who wants to marry him, and randomly asks Jack for help.
When it goes better than expected, suddenly Jack is forced to pretend to be Joe's partner, under a threat of losing his solicitor licence.
How will they handle media, paparazzis, assassination attempts and jealous partners?
And is Joseph Gallo really who he says he is, or is it more to him that meets the eye?