Ditto is a 2022 South Korean science fiction romantic drama film written and directed by Seo Eun-young, starring Yeo Jin-goo, Cho Yi-hyun, Kim Hye-yoon, Na In-woo and Bae In-hyuk. Remake of the 2000 film of the same name, it depicts story of love and friendship that takes place when a man and woman living in different time periods, communicate through a ham radio by chance. It was released theatrically on November 16, 2022.

Yeo Jin-goo is a South Korean actor. Yeo began his career as a child actor, debuting in the film Sad Movie (2005). Nicknamed "Nation's Little Brother", he went on to play the younger characters of the lead roles in films and television series such as in A Frozen Flower (2008), Giant (2010), Moon Embracing the Sun (2012), and Missing You (2012). He is known for playing the title character in the action thriller Hwayi: A Monster Boy (2013), for which he won the Best New Actor trophy at the 34th Blue Dragon Film Awards.