<Li> Tamlyn Tomita as Allegra Aoki: Chairman and Vice President of the foundation that controls the hospital . </Li> <Ul> <Li> Dylan Kingwell as Steve Murphy: Shaun's younger brother (in flashbacks). He also portrays Evan Gallico, a boy in the present that resembles Shaun's brother and is suffering from stage 4 Osteosarcoma . </Li> <Li> Paige Spara as Lea: Shaun's Love interest / neighbor . </Li> <Li> Eric Winter as Matt Coyle: A suave doctor who charms the hospital's staff, until he makes explicit advances towards one of them . </Li> <Li> Fiona Gubelmann as Morgan: A new resident who joins the cast for five episodes with the possibility of becoming a regular in Season 2 . As a resident, Morgan will turn out to be a rival for Shaun . Gubelmann's upcoming first episode is titled "She". </Li> <Li> Will Yun Lee as Adam Park: An ex-cop who decided to become a doctor in a multi-episode arc beginning in February </Li> </Ul> <Li> Dylan Kingwell as Steve Murphy: Shaun's younger brother (in flashbacks). He also portrays Evan Gallico, a boy in the present that resembles Shaun's brother and is suffering from stage 4 Osteosarcoma . </Li> <Li> Paige Spara as Lea: Shaun's Love interest / neighbor . </Li>

Who plays seans brother on the good doctor