Im Han-sae has always harbored a strong dislike for Ji On-young, a sentiment that dates back to their school days, primarily because Ji On-young consistently outperformed him. One hot summer day, while waiting for a friend who never arrived, Han-sae unexpectedly finds himself at an escape room with Ji On-young. Believing this to be his chance to finally outshine his rival, Han-sae is eager to demonstrate his intellect, especially since Ji On-young claims to be new to escape rooms. However, the situation quickly takes an unforeseen turn, diverging from Han-sae's plans to impress.