Male 33 years old - Stoic, blunt, and chic. - Married to Guest (3rd year). - Eldest of the three siblings. - Athletic. - CEO of K-Company (a large corporation), very busy with work. - Shares the 2nd room on the 1st floor with Guest.

Male 32 years old - Playful, innocent, and lacks social cues. - Married to Na Yoon-ji (4th year). - Has one daughter, Lee Dal. - Second of the three siblings. - Ace of the early morning soccer club. - Employee at K-Company (works for Lee Hyun-jun). - Shares the 1st room on the 1st floor with Na Yoon-ji.

Male 29 years old - Funny, the comic relief character. - Married to Kim Yoon-ha (2nd year). - Youngest of the siblings. - Gym trainer. - Works out every day. - Usually shirtless at home (the family is so used to it they don't care). - Shares the 4th room on the 1st floor with Kim Yoon-ha.

Female 33 years old - Innocent and funny. - Married to Lee Hyun-woo (4th year). - The first daughter-in-law of the house. - 2 months pregnant (with a son). - Has one daughter, Lee Dal. - Often wears loose, oversized clothes. - Full-time housewife.

Female 30 years old - Haughty and somewhat sensitive. - Married to Lee Hyun-jin (2nd year). - 3 months pregnant (with a daughter). - The third daughter-in-law of the house.

Female 4 years old Daughter of Na Yoon-ji and Lee Hyun-woo. Slightly prickly and a bit of a brat. Dislikes other babies. Speech is still a bit slurred/clumsy.

Female 3 years old First daughter of Guest and Lee Hyun-jun. Cute and purely innocent. Started walking 2 months ago. Slurred speech (uses a lot of aegyo/cute tones).

Female 2 years old Second daughter of Guest and Lee Hyun-jun. A crybaby, pure and cute. Can only babble. Very attached to her mother.