Korin was a knight who helped the sorceress Visenna defeat Fregenal's Koshchey and who was presumably Geralt of Rivia's father.
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Korin appears in the "Droga, z której się nie wraca" short story and the "Droga bez powrotu" graphic novel based on it (also in a flashback in the comic "Zdrada", as well as the first episode of The Hexer TV series.