"Heartbeat" explores a familial love battle of wills, as Yeon-hee (played by Yunjin Kim of "Lost" fame) whose daughter is in desperate need of a heart transplant, tries to convince a brain-dead patient's son (Park) to sign off on the transplant, but he refuses and instead investigates his mother's fall.He then appeared in the low-budget indie "End of Animal", because he found the script "very interesting."