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The new romance series follows a 20-year relationship between Dexter Mayhew (Leo Woodall) and Emma Morley (Ambika Mod), which begins when they meet on the last day of university in 1988. Each episode is set on July 15 but in a different year.
Many fans quickly realized that Woodall previously starred in the second season of HBO's "The White Lotus." The "One Day" cast also features actors from "Game of Thrones" and "House of the Dragon."
Here's a quick breakdown of the main cast and other shows and movies they were in.
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Leo Woodall had a breakout performance in "The White Lotus" season two.
Leo Woodall in "One Day" (left) and "The White Lotus."Netflix / HBO
Ambika Mod stood out in the British medical drama "This is Going to Hurt."
Ambika Mod in "One Day" (left) and "This is Going to Hurt."Netflix / BBC
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Eleanor Tomlinson starred in "Angus, Thongs and Perfect Snogging."
Eleanor Tomlinson in "One Day" (left) and "Angus, Thongs and Perfect Snogging."Netflix / Paramount Pictures
Jonny Weldon made a brief appearance in HBO's "House of the Dragon."
Jonny Weldon in "One Day" (left) and "House of the Dragon."Matt Towers / Netflix / HBO
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Amber Grappy has played a supporting cast member in numerous shows.
Amber Grappy in "One Day" (left) and "Wreck."Netflix / BBC
Tim McInnerny appeared in "Game of Thrones," "Sherlock" and "Doctor Who."
Tim McInnerny in "One Day" (left) and "Game of Thrones."Netflix / HBO
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Essie Davis also appeared in "Game of Thrones."
Essie Davis in "One Day" (left) and "Game of Thrones."Matt Towers / Netflix / HBO