Info Image Kim Do-jin (played by Jang Dong-gun)
Architectural designer, this man handsome with bad gangster, very critical of everything around him, more disdain for female friends, firmly believe in celibacy, unwilling to easily get married and share their hard-earned money with women. He has always been very critical and neurotic, and never cares about what harm the other party will suffer, but only carries out his own self to the end, so 80% of his words are poisonous and 20% are intellectual. Typically from a science background, he has a morbid obsession with scores and statistics. Im Tae-san (Kim Soo-ro)
Lim Tae-san, a construction foreman, occasionally shows off his muscles to impress his female clients, but he won't allow his girlfriend to dress in revealing clothes, and when he sees her talking intimately with other men, he will just walk up to her and drag her away.
He has a hotter-than-hot "teenage" innocence and a sexy mind. He likes to drink, loves his friends, and values righteousness above all else. Choi Yoon (Kim Min Jong)
Choi Yoon, a lawyer, is an elegant man who acts and thinks maturely, has a serious and affectionate personality, and is also a homebody who can cook, and is devoted to his wife's death and is still single four years later. His logic and wisdom, knowledge and common sense are not easily lost to others. Lee Jung-rok (Lee Jong-hyuk)
Lee Jung-rok, a coffee shop owner, is married to a rich woman who is older than him. His heart is y in love with his wife, but his philandering and flirtatious personality makes him unable to resist taking off his wedding ring to offer his love whenever he sees a beautiful woman after marriage. Optimistic and timid, he sings well, dances well, and is a natural born idle good-for-nothing. He is smarter than people think and knows how to give up as soon as possible. Seo I-soo (Kim Ha-na)
She's not tough but determined, not fussy but principled, and her character is eight parts mighty and dominant, but the other two parts are fluffy and soft. Thanks to Isshu's razor-sharp personality, even the students privately call her "the goddess of ethics.
Because of her good looks and stable career, she is constantly being recommended for marriage. Hong Se Ra (Yoon Se Ah)
Se Ra is beautiful, Se Ra is sexy, Se Ra is fashionable, and because of these reasons, men love Se Ra.
Both young and beautiful, even her strength is unrivaled, and she is always inundated with people who want to play with her, from politics and economics to religion. She's a celebrity in the spotlight wherever she goes, and that's the only way to keep her satisfied. Park Min-sook (Kim Jung-ran)
A 44-year-old with the beauty of a 30-something, combined with her wealth and education, Min-sook is truly melancholic, even though outsiders think she would have had no chance to be melancholic. Lim Echo (Yoon Jung Yi)
With a golden ratio of beauty and dimples that would make Mondrian ashamed of himself, and a dimple that surpasses Lee Hyori's, she configures that beauty that only those who have saved the country in a previous life are blessed with, and men quickly gather around her at LTE speed when they meet her. Colin (Lee Jong Hyun)
American-born, Japanese-raised, cosmopolitan Colin is a Korean. With his late adolescence and occasional Korean rebellions, he eventually makes the extreme choice of running away from home. Afterwards, he is a teenager who is so desperate and happy to stay at Do Jin's house. This is a boy who uses innocence as his weapon and a smile as his strategy. Note: Characters referenced from