- Anita Petry - Seminar Leader
- Sebastian de Souza - Gareth
- Killian Coyle - Pat
- Muiris Crowley - Mr. Kerrigan
- Fiona Browne - Fiona Moran
- Ciara Berkeley - Student 1
- Maya O'Shea - Jenny
- Lauryn Canny - Teresa
- Chris McHallem - Lecturer
- Domhnall Herdman - Matthew
- Domhnall Herdman - Matt
- Tina Kellegher - Trish
- Gwynne McElveen - Aunt Caitlin
- Denis Conway - Gerald
- Liz Fitzgibbon - Ms. Neary
- Kwaku Fortune - Philip
- Slaney Power - Sophie
- Fionn O'Shea - Jamie
- Lancelot Ncube - Lukas
- Conor Mullen - Tom
- Michael Phong Le - Matt
- Noma Dumezweni - Gillian
- Aoife Hinds - Helen Brophy
- Claire O'Donovan - Eileen
- Michael Power - Val
- Blaithin Mac Gabhann - Evelyn
- Leah Minto - Sadie
- Aoibhinn McAuley - Anna
- Sean Duggan - Matt
- Olga Wehrly - Sarah
- Eleanor Methven - Bernie
- Niamh Lynch - Karen
- Leah McNamara - Rachel Moran
- Seán Doyle - Eric
- Killian Filan - Jack
- Clinton Liberty - Kiernan
- Sarah Greene - Lorraine Waldron
- Aislín McGuckin - Denise Sheridan
- Eliot Salt - Joanna
- Frank Blake - Alan Sheridan
- Éanna Hardwicke - Rob Hegarty
- India Mullen - Peggy
- Joseph Palmer - Mourner
- Emma Norton
- Emer O'Shea
- Tommy Bulfin
- Lenny Abrahamson
- Anna Ferguson
- Sally Rooney
- Stephen Rennicks
- Steve Fanagan
- Anna Bertmark
- Niall O'Sullivan
Daisy Edgar-Jones interpreta a Marianne Sheridan en la serie.
Paul Mescal interpreta a Connell Waldron en la serie.
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