Jaehee is defiantly Belle. I mean, come on, she would fit the role so well. She's as patient as Belle and is also she's very kind but still very cautious, just like Belle.

Jumin would be the Beast. I'm sorry but this ship is happening in this crossover. Jumin isn't very patient like the Beast. He's also protective and, when he feels he's lost everything, he kinda gives up. Like in Jaehee's route. Still swear that car crash was a suicide attempt because he lost Jaehee.

Zen would be Gaston. Only similarity would be the narcissistic personality. I'd change the character a little, though. Like, Zen would still be nice to Jaehee. The only reason he would fight Jumin would be because MC said that he was a threat to Jaehee, who is his best friend who he may or may not have a crush on.

MC would totally be the father of Belle. MC is the best friend who opened a bakery with Jaehee and was going to a food convention before she took a wrong turn to the castle. Jaehee saved her by staying there and that's when MC told Zen that Jumin was a threat to Jaehee. MC would've been sick by the cold dungeon she was kept in and when Jaehee checks on the mirror, MC is deathly pale and coughing and sneezing as she tries to help Zen organize a plan. Jaehee goes since nobody will take care of MC and shows Jumin through the mirror when she starts getting questioned but she doesn't get a chance to explain before Zen is off to kill Jumin because he looked too dangerous to let live.

That's my Beauty and the Beast X Mystic Messenger crossover.