When Choi Jin Hyuk announced his plans to spend Christmas Eve with his "The Heirs" co-star Lee Min Ho, fans may have noted yet again how many kdrama actors are good friends with other actors.

Some actors like Lee Min Ho and Jung Il Woo or Rain and Kim Kwang Min have known each other since they were in school together. Others met on set.

Jung Il Woo and Lee Min Ho were classmates in high school, who grew closer after they were involved in a serious accident together. But he is also close to his "Unstoppable High Kick" co-star Kim Bum. He lists the two as his best friends.

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