: High-Efficiency Video Coding, which provides high video quality at a smaller file size compared to traditional formats.
(played by Jeon Do-yeon): A retired national athlete who now runs a popular side-dish store. She is high-spirited and dedicated to her niece (whom she raises as her daughter), eventually entering the competitive private education scene to help her get into a top academy. : High-Efficiency Video Coding, which provides high video
(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 : High-Efficiency Video Coding