Guest Stars Oscar Unsworth as Rhodri Howells Harry Unsworth as Rhodri Howells Mark Lewis Jones as Steve Baldini Hannah Daniel as Cerys Jones Eiry Thomas as DI Susan Williams Lacey Jones as Megan Howells Demi Letherby as Alys Howells Aneirin Hughes as Tom Howells Suzanne Packer as Delyth Lloyd Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Rhian Morgan as Marion Howells Mali Harries as Bethan Price Matthew Gravelle as Terry Price Richard Elfyn as DCI Huw Parry Kizzy Crawford as PC Emma Jones Pinar Ogun as Dr. Meral Alpay Shelley Rees as DS Morgan Mair Rowlands as Carol Foster Rhodri Evan as Richard Taylor Catrin Brooks as Headmistress