Dex is played by Lino Facioli
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Netflix's Sex Education: Meet the cast
23. Dex is played by Lino Facioli
Dex, member of the Moordale quiz team, is new character for season 2 and is played by Lino Facioli. Some of you may recognise Lino from his role on Game of Thrones. He played Robin Arryn, son of Lysa Arryn and reappeared in one episode of the final season. He also previously played the role of Naples in Get Him to the Greek. [Netflix]
