<Li> Jodie Comer as Kate Parks , a 23 - year - old University graduate who has been secretly having a two - year affair with Simon Foster . </Li>
<Li> Jodie Comer as Kate Parks , a 23 - year - old University graduate who has been secretly having a two - year affair with Simon Foster . </Li>
who is doctor foster 's husband having an affair with
who is doctor foster 's husband having an affair with
Kate Parks
Kate Parks