Kim Su-gyeom

Family Relationship: Manager Kim's only son, a figure who receives his father's deep love and protection. Academic Background: An elite college student currently attending the prestigious Yonsei University. Extremely handsome. Kind-hearted. Has a secret crush on Lee Han-na (doesn't show it).

Park Ha-jin

Extremely beautiful. Relationships: Manager Kim's wife and mother to their son (Kim Su-gyeom). Personality and Traits: Unlike Manager Kim, who is obsessed with vanity and saving face, she is very realistic, frugal, and has strong survival skills. She tries to keep him grounded when he faces crises at work or wavers in his asset management or outlook on life. Role: A character who contrasts with her husband's hollow obsession with the title of 'Big Corp Manager,' representing the ordinary but strong mother and wife of our time.

Baek Jeong-tae

Position and Relationship: An executive at the same company as Manager Kim, serving as his primary rival and competitor. Personality and Traits: Just as sensitive to office politics and performance as Manager Kim, he subtly keeps Kim in check and provokes him. He points out Manager Kim's vanity or weaknesses to compete for standing within the company. Role: Serves as a medium to vividly show the promotion pressure, anxiety, and cruelty of office politics that Manager Kim feels. He represents the corporate faction that contrasts with Manager Kim's situation or drives him into crisis. Works at ACT.

Do Jin-woo

Position and Relationship: Fast and smart at work, he is Manager Kim's rival and lives in a 4-billion-won apartment. He is on a different team from Manager Kim. Personality and Traits: While skillfully handling the demands of the old-school Manager Kim, he is a clever individual who manages himself realistically like the modern generation. Unlike Manager Kim who is tied to the company, he represents the trends of modern workers, such as smart job-hopping, self-development, and investing. Role: To Manager Kim, he is a 'capable junior I raised and cherish,' but that's not how the company sees it. Works at ACT.

Kim Han-na

Beautiful and kind. Has a secret crush on Kim Su-gyeom (doesn't show it). Student at Yonsei University. May go study abroad.

Jung Seong-gu

Deputy Manager. Handsome. Has a girlfriend. Knows that Manager Kim is a bit of a nutcase. On the same team as Manager Kim. Works at ACT.

Kwon Song-hee

Beautiful. Kind. Staff member. 3rd year at the company. She doesn't laugh at the manager's lame jokes and speaks up against unreasonable instructions—a modern new employee who acts with more responsibility than anyone when working. She doesn't seem to like the company, but she has a strong desire to be recognized for her work. She came to a major corporation to do proper work, but between contextless meetings, useless overtime, and cleaning up after seniors, she wonders if this is really the 'Big Corp' she wanted to join so badly. On the same team as Manager Kim. Works at ACT.

Heo Tae-hwan

Joined the company at the same time as Manager Kim, but after missing several promotions, he became a 'perpetual manager' who constantly walks on eggshells around his teammates. He is kind but has a frustrating personality and works slowly, so he is always on the list of candidates whenever there is talk of restructuring. He was on the same team as Manager Kim but got fired and now runs a car wash.

Song Ik-hyeon

Possesses fast work processing skills and a reliable personality. He is kind and sometimes acts as Manager Kim's right-hand man. Works at ACT.