The fourth and final season of Sex Education added new names to its main cast, including Jack Gleeson, who made a surprising appearance. The actor first rose to prominence as Joffrey Baratheon in the hit fantasy show Game of Thrones. However, Gleeson announced his decision to retire from acting in 2014, right when he found himself at the top of his game.
Source：https://www.cbr.com/sex-education-jack-gleeson-comeback/
