"We've been forging this friendship for over 25 years together… through this shared journey," the actress tells PEOPLE For Renée Zellweger, reuniting with Colin Firth and Hugh Grant on the set of Bridget Jones: Mad About the Boy was a bittersweet experience.

The “Bridget Jones” franchise is long beloved by fans, due in extremely large part to Renée Zellweger’s portrayal of the title character. So, yes, the actress was a resource director Michael Morris turned to a lot while making the fourth film — and there was one particular insight from the Oscar winner that he says unlocked the whole thing.

And just like that, Ejiofor was cast as Mr. Wallaker, a pragmatic science teacher, in Bridget Jones: Mad About the Boy, the fourth installment in the beloved romantic comedy franchise starring Renee Zellweger as the titular heroine, which hit Peacock on February 14.