For Hemi, a boyfriend in a protective suit would be an easy thing to deal with compared to her own problem: she's in love with a Coffee Vending machine! Of course, it all makes perfect sense once you realize that he's actually an ancient Samurai who wished to be reborn into an indestructible steel body. But it certainly makes the dates uncomfortable and somewhat prone to scalding!

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.