In You Who Came From the Stars, episode 14, Cheon Song Yi(played by Jun Ji Hyun) fell during a wire action. Song Yi was shooting a wire action scene for a drama in a studio, when suddenly a wire snapped. She fell to the ground and lost her consciousness. She was sent straight to the hospital, but was in a critical condition.
You Who Came From the Stars Episode 14 Review: Jun Ji Hyun Falls During a Wire Action