Milly Alcock starred as young Rhaenyra Targaryen in "House of the Dragon," where her character's storyline is closely intertwined with Daemon Targaryen, played by Matt Smith. The chemistry and dynamic between these two characters are pivotal to the series, leading to speculation and rumors about their on-screen relationship. Smith's portrayal of Daemon, a complex and ambitious character, complements Alcock's performance, making him a notable co-star in the show.