Jang Kyung-chul, Deputy General Manager of the Sales Department at Hongseong International. He is willing to play the villain for the sake of performance. That is how his career has been so far, and how he reached his current position. Seeing his junior Gong Eun-tae suddenly change one day, he finds himself inwardly wanting to cheer him on. He is prickly on the outside but has warmth within.

An ordinary office worker who won first prize in the lottery, and the rookie Team Leader of Sales Team 5 at Hongseong International. He worked harder and faster than anyone else to earn a high-speed promotion, yet he lived without ever being able to get angry in unfair situations. On a day when he was trying to swallow his rage alone with a beer as usual, a lottery ticket he was forced to take instead of change turned out to be the first-prize winner, completely changing his corporate life.

Yang Jun-ho, an Assistant Manager in Sales Team 5 at Hongseong International who is a bit of a wild card. He is incredibly quick-witted and perfect at handling work. Despite being thorough enough to look after the personal lives of the lowest-ranking staff, luck with promotions has eluded him. To make matters worse, he is assigned as an Assistant Manager under Gong Eun-tae, creating a subtle tension within the team with the sociability and leadership that Eun-tae lacks.