In 2016, Adewunmi played Benedict in the third series of the CBBC Online web series Dixi.
2017
He made his feature film debut as Isaac in the 2017 crime film The Hatton Garden Job and guest starred in the Doctor Who series 10 episode "The Eaters of Light"
2019
He won Most Promising Newcomer at the British Independent Film Awards as well as receiving a Best Actor nomination for his role in the film The Last Tree (2019).
He was nominated for a BAFTA for his role in the BBC drama You Don't Know Me (2021).
He was named a 2019 Screen International Star of Tomorrow.
Adewunmi was born in Camden, London to a single Nigerian Yoruba mother, a chef.
He and his brother grew up on the Maiden Lane Estate just north of King's Cross and St Pancras stations, the same estate where Tin Luck was filmed.
He first discovered drama through a school play in year three, and was eight when he put on a community play at the Camden People's Theatre.
He trained at Identity School of Acting.
Adewunmi led the film The Last Tree and signed with United Talent Agency (UTA) shortly after its premiere at the 2019 Sundance Film Festival.
For his performance, he won Most Promising Newcomer at the British Independent Film Awards and was nominated for Best Actor.
He also received two National Film Awards UK nominations.
2020
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 and led the BBC One adaptation of You Don't Know Me as Hero.
For the latter, he was nominated for the British Academy Television Award for Best Actor.
Adewunmi made his professional stage debut starring in the world premiere of Trouble in Butetown at the Donmar Warehouse in February 2023.
He will make his West End debut in A Mirror at the Trafalgar Theatre in January 2024.