Baek Su Jeong works as the leader of a planning team at Yongsung Department Store. The department store is widely regarded as the best in the industry. She is a hard worker and is recognized for her top performance at her job. She won't hesitate to butt heads with anyone in the company rather than suppressing whatever it is that bothers her. One day, she meets Ban Ju Yeon for the first time in 16 years. He begins to work as her boss, the director of the strategic planning division. He is also the successor of the department store. When Su Jung was in her teens, she first met Ju Yeon through an online game. He used the game ID of "Black Salt Dragon," which was the symbol of teenage angst. That time has remained one of the worst memories in her life. In his teens, Ju Yeon first met Su Jeong, who used the game ID "Strawberry." He fell in love with her and she was his first love, but, as soon as he confessed his feelings to her, she dumped him. This was the first taste of bitterness in his life. 16 years later, Ju Yeon is now all grown up. He meets Su Jeong as his subordinate at work. Adapted from the webtoon "He’s a Black Dragon" (그놈은 흑염룡) by Hye Jin Yang (혜진양).