Martial law is declared when a mysterious viral outbreak pushes Korea into a state of emergency. Those on an express train to Busan, a city that has successfully fended off the viral outbreak, must fight for their own survival…
Sunhi from the Department of Film stops by the school one day to get a letter of recommendation from Professor Choi to leave to the US. She expects him to write her a nice one since he took favor to her. She runs into two men from the past she’s never met in a long time; Moon-soo, a recently turned movie director and senior director Jae-hak.
Kyungcheon is a pianist-in-training who loses his heart and becomes a milk cow. He lives as a man during the day, but becomes a milk cow at night and eats grass. Meanwhile, with the help of wizard Merlin, a satellite named Ilho fell from the cosmos by a supernova, is transformed into a girl. One day, Kyungcheon is attacked by members of a secret agency that chases people who lost their heart. Kyungcheon defeats them with the help of Ilho. Following a narrow escape from secret agents, the two mismatched characters come to know about each other’s secrets and draw close.
Kim Sun-woo is an enforcer and manager for a hotel owned by a cold, calculative crime boss, Kang who assigns Sun-Woo to a simple errand while he is away on a business trip; to shadow his young mistress, Heesoo, for fear that she may be cheating on him with another, younger man, with the mandate that he must kill them both if he discovers their affair.