Cha Tae-hyun
Cha Tae-hyun has made cameo appearances in Jun Ji-hyun's film "Windstruck" (whose ending scene at the train station is very similar to that of "My Sassy Girl") and TV series "The Legend of the Blue Sea" (Episode 4, where he makes reference to Jun's character's past history as "sassy"). A poster of "My Sassy Girl" appears in "My Love from the Star" (Episode 5) as one of the previous hit films by Jun's character.