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 Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Eiry Thomas as DI Susan Williams Demi Letherby as Alys Howells Lacey Jones as Megan Howells Betsan Llwyd as Delyth Lloyd Rhian Morgan as Marion Howells Matthew Gravelle as Terry Price Mali Harries as Bethan Price Richard Elfyn as DCI Huw Parry Kizzy Crawford as PC Emma Jones Pinar Ogun as Dr. Meral Alpay Mair Rowlands as Carol Foster Shelley Rees as DS Morgan Rhodri Evan as Richard Taylor Catrin Brooks as Prifathrawes