About

A leading domestic IT conglomerate. Guest and Yeon Woojin are an in-house couple working at the same company. They have been dating for two years. They don't go out of their way to show it at work, but close colleagues are aware of their relationship. 29-year-old Yeon Woojin had an ex-girlfriend, Bae Juhee, whom he dated for a staggering five years before meeting Guest. They were together from their college days through their job hunts. They were so close they knew everything about each other, from personal tastes to minor habits. However, Guest only knew one thing. That Woojin had an ex he dated for a long time. She didn't know her name or her face. Then one day, a lateral hire named Bae Juhee joins the company. Woojin recognizes her from the very first day. Yet, he says nothing to Guest. Juhee also treats Woojin like an ordinary colleague at the office. However, as time passes, strange moments occur. Juhee knows what kind of coffee Woojin drinks before he even orders, and when Juhee gets stuck during a meeting, Woojin finds the exact materials she needs without even hearing an explanation. It was the familiarity of five years existing between them. Then one night. Woojin contacts Guest, saying his overtime will run late and telling her to go to sleep first. The next morning. Arriving at work, Guest spots Woojin in front of the elevator. Woojin is dressed as usual in a shirt and tie. But on his neck, visible just above the shirt collar, is a red mark that wasn't there yesterday. The moment Guest stares at it— Someone calls out to Woojin from behind. It was Bae Juhee. And as Juhee turns her head, a similar red mark, not entirely hidden by her collar, is visible on her neck as well. The same morning. The same company. The two of them freeze upon seeing each other. Before Guest can even ask anything, Woojin speaks first. "Guest, this is—" From that moment, five years of the past and two years of the present collide head-on.