Guest Stars Oscar Unsworth as Rhodri Howells Harry Unsworth as Rhodri Howells Mark Lewis Jones as Steve Baldini Aneirin Hughes as Tom Howells Hannah Daniel as Cerys Jones Bradley Freegard as Evan Howells Alex Harries as Arthur Davis Catherine Ayers as Lisa Connors Eiry Thomas as DI Susan Williams Lacey Jones as Megan Howells Demi Letherby as Alys Howells Betsan Llwyd as Delyth Lloyd Rhian Morgan as Marion Howells Anastasia Hille as Gael Reardon Aimee-Ffion Edwards as Madlen Vaughan Rhashan Stone as DI Laurence Breeze Martha Bright as Angie Baldini Brochan Evans as Dyfan Vaughan Steffan Rhodri as Y Barnwr Gwyn Daniels Rhian Blythe as Anya Flye Rebecca Harries as Hannah Lewis Richard Lynch as Hayden Swancott QC Billy Hartman as Gemydd Crystal Yu as Dr. Sarah Collins Rhodri Sion as Madog Jones Daniel Edwards as Gard