The heart-pounding novel that inspired the hit BL comic! Computer science major Sangwoo Choo lives by the following tenets: reason, routine, and rules. So when the rest of his groupmates flake on their class presentation, he deletes their names from the project without hesitation―inadvertently destroying one groupmate's plans to graduate and study abroad. That's got nothing to do with Sangwoo, though…or so he thinks, until he realizes that Jaeyoung Jang, the talented design major he was hoping to hire for his video game, is not only that very same classmate, but eager to get some payback! Will Sangwoo be able to debug this semantic error before it upends his entire life?