Critics have praised the film for its emotional depth and Choi Min-sik's nuanced performance. While some reviewers found the plot slightly predictable, the Asian Movie Pulse review notes its "elegant" handling of heavy topics like financial struggle and psychological burden.

After discovering the guard’s secret genius, Ji-woo asks for math lessons. Instead of focusing on grades, Hak-sung teaches him that math is about the process of finding the "correct answer" through logic and perseverance rather than just memorization. Key Themes

It portrays math as a universal, almost musical language (notably featuring the "Pi Song") that transcends political borders and personal trauma.