Appearance: Extremely handsome Age: 27 Personality: Cold and aloof. Completely professional and has a strong sense of responsibility when working. At first, he takes care of others through actions rather than words, but once he gets close, he becomes a tsundere with a playful side, appearing exactly when needed to help out. Characteristics: A K-League 2 MVP, Junhyun played for FC Sunyang before transferring to Choiseong FC with dreams of the Premier League. He tried to fulfill a promise to his grandmother who has dementia, but his career ended due to a hit-and-run accident just one day after joining. Choiseong FC terminated his contract, and he later joined as an intern with the help of Chairman Kang Yongho. He lives with his grandmother and calls Kang Banggeul 'Kang Ppang-geul' (Smiley). Family: Grandmother Heo Oksun

Appearance: Extremely beautiful Age: 27 “I promised I wouldn't stand out. It's my ultimate survival method, so don't laugh.” Personality: Bright and cheerful, the type to liven up the atmosphere anywhere. Honest with her emotions and has big reactions, making her fun to be around. She loves people and has a lot of affection, taking good care of those around her. Occasionally clumsy, but has a personality that's impossible to hate. Characteristics: A new employee at Choiseong Group. She is the biological daughter of Chairman Kang and Jo Sunhee, and the half-sister of the Choiseong family's third-born triplets. Sent to the U.S. 15 years ago, she was supposed to live as a hidden child of a chaebol family... but she recently returned to Korea without her family's knowledge and became an intern at Choiseong C&T. She bickers with Hwang Junhyun and has feelings for him.

Age: 42 “That damn competition! Even though I'm sick of it, I grit my teeth and endured. Choiseong is mine. I will definitely take it.” Personality: Cold-headed and calculating, a realist who judges situations quickly. A leader with strong charisma who naturally takes center stage. Proud and stubborn, she doesn't back down easily. Characteristics: Among the many housekeepers who passed through the Choiseong household, she liked and followed Sunhee the most, but Sunhee took over the master bedroom just one year after her mother passed away. Because of that, she never considers Jo Sunhee her mother. She intends to take over Choiseong and constantly fights with her twin brother, Kang Jaeseong. President of Choiseong Chemical.

Age: 42 Personality: A cold realist with quick judgment and strong leadership. Charismatic and takes charge, but is very proud and stubborn. Cold on the outside but has a strong sense of responsibility. However, he has a dual nature, willing to use cowardly means to achieve his goals. Characteristics: An expert at barking up the wrong tree. He has overflowing greed but a small capacity. President of Choiseong C&T. Since being born 50 seconds earlier, he has never properly beaten Jaekyung. Because of this, he always looks pathetic and has a significant inferiority complex. Husband of Na Eunse.

Age: 37 “I'm very good at throwing things away, Father. I'm a Taeha person before I'm a Choiseong daughter-in-law.” Personality: Calm and neat, giving off a clean and trustworthy first impression. She tends to restrain her emotional expression and doesn't reveal her inner thoughts easily, but her heart is full of the desire to take over Choiseong with her father. Characteristics: The daughter-in-law of the Choiseong family and the 'Queen of Inner Help' who enabled Jaeseong to endure as Jaekyung's rival. She is the hidden strategist of Taeha whom Byeongmo planted in the Choiseong family. As a child, she had to live suppressed by the arrogance of her older brothers who were set to inherit Taeha Group.

Age: 72 “You guys just tap on calculators to judge if something makes money or not. Do you think you can be Chairman in a month acting like this?!” Personality: An authoritative leader with strong charisma and a cold, profit-oriented judgment. Decisive and driven, he pushes forward once he makes a choice. Cold on the outside, but a responsible type who looks after his family and company. He expresses little emotion and is the style to take care of things quietly from behind. Characteristics: Chairman of Choiseong Group. Husband of Jo Sunhee and father of Kang Jaeseong, Kang Jaekyung, and Kang Banggeul.

Age: 55 Personality: Meticulous, has a strong sense of responsibility, and is fiercely loyal. Characteristics: A long-time friend of Chairman Kang Yongho and his most trusted loyalist. Executive Vice President of the Strategic Planning Office at Choiseong Group.

Age: 60 “Don't worry. I've lived in this house for 30 years. Even if I leave, I'll leave on my own two feet.” Personality: Kind, warm-hearted, and very patient. Characteristics: Chairman Kang's second wife and Kang Banggeul's biological mother. She was the only person who could satisfy the picky tastes of Kang Yongho. The mistress of the Choiseong household.

Age: 68 “Kang Jaeseong is just the bait to catch Choiseong. The time to drive the harpoon into the whale will come soon.” Personality: A cold businessman who moves based on thorough calculation and profit. Authoritative, highly charismatic, and very greedy. He does not hesitate to make realistic and ruthless judgments, using people according to the situation. Characteristics: Chairman of Taeha Group.

Age: 46 “Junhyun. I'm a man who wants to live quietly. I hate conflict more than anything in the world.” Personality: Kind, playful, and meticulous. Characteristics: Once the ace of the Audit Team, he is now a nobody in the Materials Team. He was incredibly good at finding corruption others missed, but after discovering Kang Jaeseong's illegal real estate speculation, he was demoted to the Materials Team, a peripheral post. Because he was a special hire, he had no 'line' to protect him. Since then, he has lived modestly with the motto 'Thin and long, even longer,' walking carefully and even washing his water before drinking it... but lately, he's been living on heart-calming pills because of this Hwang Junhyun! He bickers with Hwang Junhyun.