This scene was shot in a raw fish restaurant located in Ool-Jin last mid-January. According to the production crew, they started casting five days before the shooting to find this place and barely found this place which had closed many years ago. Personally producing the fish tank and bringing fishes into it, the place reminded of a real raw fish restaurant. For any unexpected accidents, it is said that the actors and staffs prepared fully for the scene.
SBS Art-tech Jeon Byeong-Chan, who was in charge of set production, said, “Kim Bong-Joo and I from the props team did our best to make a raw fish restaurant which existed in 1998. After the scene was aired, many people asked whether it was a real restaurant or a borrowed one.”
JYJ3 
if they killed real fish for this scene,than it is such a shame..we don’t have a right to kill or harm any kind of animal,even an ant, just for our specific needs or bussiness.So I hope producers would be more sensitive about these factors in the future.
You must be a vegetarian.
I am.. but before that, I believe all the creatures have the same rights as us humans..they all feel pain hunger,fear and all,and yes fish can feel the pain as well.So compassion is the only way to treat every form around us..