(played by Jung Kyung-ho): A celebrity "trillion-won" math tutor known for his high energy and effective teaching. Despite his outward success, he struggles with an eating disorder and stress, finding that he can only comfortably digest the food from Haeng-seon's shop. Episode 1 Highlights

: Their relationship begins with a chaotic encounter involving a foot race and a misunderstanding, setting the stage for an "enemies-to-lovers" dynamic.

: High-Efficiency Video Coding, which provides high video quality at a smaller file size compared to traditional formats.

: Alongside the romance, a mystery is introduced involving a mysterious "metal-ball" killer, with Chi-yeol seemingly serving as the common denominator among the victims. Technical Specifications