Beseuteu Miseuteikeu / 베스트 미스테이크 A man and a woman with the same trauma, yet different personalities. Before them arrives the best mistake of their lives! "Ahreum" spends another depressing day working at the convenience store without a single call from her boyfriend. The arrival of a handsome but flamboyant customer "Kyungjun" makes her day become worse, with his date throwing up on the floor and Kyungjun's continuous flirting. After the hectic day is over, she next meets Kyungjun at a totally unexpected place. Will meeting Kyungjun change her already complex life for the better or worse?