Who were the only people who knew combination to suitcase in Pulp Fiction?

In the movie Pulp Fiction, the only people who knew the combination to Marsellus Wallace's briefcase were Marsellus Wallace himself and his wife, Mia Wallace.

Here's why:

* The briefcase is never opened in the film. The audience never sees what's inside, and the characters are only shown interacting with it in a few scenes.

* Marsellus is deeply protective of the briefcase. He keeps it close at hand, and when Jules Winnfield accidentally opens it, he is extremely upset and demanding.

* Mia's knowledge of the combination is implied. In the scene where Mia is dancing with Jules, she reveals that she knows the combination. This suggests that Marsellus entrusted the information to his wife, but it's never explicitly confirmed.

The mystery of the briefcase's contents is a key element of the film's intrigue and remains one of the most debated topics among fans.