[1] Adewunmi was born in Camden, London to a single Nigerian Yoruba mother, a chef.

[7] For his performance, he won Most Promising Newcomer at the British Independent Film Awards and was nominated for Best Actor.

In 2020, he starred as Carcer Dun in the BBC America adaptation of Terry Pratchett's The Watch and the short film Tin Luck.

In 2021, Adewunmi starred in the ITV thriller Angela Black[8] and led the BBC One adaptation of You Don't Know Me as Hero.

Adewunmi made his professional stage debut starring in the world premiere of Trouble in Butetown at the Donmar Warehouse in February 2023.