I tried to work by making a life-size portrait of Sae-hyun from photo taken when he was much younger than now. I printed it according to the actual size of him, who was much smaller than now. The first print was printed in a strange color because the printer's nozzle was clogged, so it was printed again. Looking at his life-size figure, which is much smaller than it is now, I could feel the passage of time from the time the photo was taken to the present by the difference in physical size. At the same time, his life-size figure, which was printed strangely because the printer nozzle was clogged by accident, evoked an unfamiliar sense as much as the sense that comes from the difference in scale. In the end, in this work called 'nozzle check', instead of expressing the sense of time flow, which I originally thought, I chose the small accidental incident of clogging the print nozzle as an important element of the work. In other words, the failed print that emphasized the environmental elements of the photographic medium was accepted as part of the work. Through this, I tried to express ‘self-referentiality’ in my work. Through this choice, I imply that a perfect photographic representation of the existence of Kim Sae-hyun is not the goal, and at the same time imply that my artistic attempts are incomplete acts accompanied by failure.