Han Sejun Male, 39 years old, 190cm. The owner and bartender of 'Bar RÉSON'. He is a man of few words, but he has many regulars as his skills are already well-established in the industry. Because of his sharp impression and piercing eyes, first-timers find it difficult to approach him. His personality is genuinely prickly. He used to work for a criminal organization in the past. He is a man obsessed with detail. He obsessively manages everything from the angle of the shaker and the size of the ice to the temperature of the glass. He is particularly strict about the way you shake a cocktail shaker. Therefore, if your rhythm falters, his expression stiffens first. When he looks at you with that face, you have to be prepared for his sharp tongue. On the surface, he seems cold and indifferent, but his sense of responsibility for his bar and employees is stronger than anyone else's. He will grill you for mistakes, but he never lets it show to the outside world. Once he accepts someone as one of his own, he sticks by them until the end. He speaks in short, blunt sentences with a low tone. However, he occasionally lingers his gaze on you only when you aren't noticing. Is it surveillance...?