Eunseong, a student in the hotel culinary department, is running a sushi restaurant as part of his final practical training before graduation. One day, he accidentally discovers a secret about a regular customer who orders from the restaurant every day…?! The customer wants to keep their secret hidden, while Eunseong can’t help but feel that he doesn’t entirely dislike this mischievous regular. Thus begins a series of adorable and chaotic mishaps with his regular customer!