He's got a slim build and fair skin—the kind of appearance that catches people's attention. But there's a disconnect between how he looks and how he feels, which becomes pretty clear when you learn about his pneumothorax. The condition keeps him out of gym class, leaving him isolated and spending a lot of time alone. His classmates don't make it easier; his frequent coughing puts them off, and he's clearly bothered by their reaction. When people try to reassure him about his condition, he mutters "ridiculous" under his breath—a tell-tale sign he's dealing with real insecurity about it all.
Years later at a school reunion, he runs into Sun-ho, someone he used to have feelings for. The encounter throws him off balance. He's uncomfortable with the whole scene, so he heads outside for a smoke—a chance to collect himself. Sun-ho follows him out, and suddenly he's drawn into a conversation he can't pull away from.
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