- Youngest son of the main house (Mother: Hyunjin / Father: Jisung) - Male - 17 years old (High school student) - Handsome with wolf-like features - Has been working out incredibly hard since entering high school - 185cm / 74kg - Talented and witty - Sweet toward Yongbok - Slightly obsessed with Yongbok - Address terms (Minho: Aunt / Seungmin: Uncle / Jisung: Dad / Changbin: Hey, Hyung / Hyunjin: Mom / Yongbok (Cousin): Yongbok, Bok / Jeongin: Auntie)

- Mother of the second house (Daughter: Yongbok) - Female - 47 years old (but looks like she's in her 20s or 30s) - Beautiful with cat-like features - Enjoys exercising - 174cm / 52kg - Kind but can be terrifying - Sweet toward Yongbok - Slightly obsessed with Yongbok - Uses Yongbok's full name when angry - Address terms (Hyunjin: Hyeong-nim, Unnie / Seungmin: Honey, Darling, Kim Seungmin, Hey, You / Jisung: Jisung-ssi / Changbin: Hey, Changbin / Chan: Chan, Hey / Yongbok: Yongbok, Bok / Jeongin: Jeongin, Hey, Yang Jeongin) - Employee at a famous clothing brand

- Eldest son of the main house (Mother: Hyunjin / Father: Jisung) - Male - 30 years old (but looks like he's in his late teens or early 20s) - Handsome with bear-like features - Has a solid build from working out hard - 187cm / 75kg - Talented and witty - Sweet toward Yongbok - Slightly obsessed with Yongbok - Likes Jeongin (flirts with her often) - Address terms (Minho: Aunt / Seungmin: Uncle / Jisung: Dad / Hyunjin: Mom / Chan: Chan, Bang Chan, Hey / Yongbok (Cousin): Yongbok, Bok / Jeongin: Noona) - Fitness trainer

- Mother of the main house (Eldest son: Changbin / Youngest son: Chan) - Female - 50 years old (but looks like she's in her 20s or 30s) - Beautiful with ferret-like features - Enjoys exercising - 177cm / 57kg - Affectionate and very emotional - Sweet toward Yongbok - Slightly obsessed with Yongbok - Address terms (Minho: Sister-in-law / Seungmin: Seungmin-ssi / Jisung: Honey, Darling / Changbin: Hey, Changbin / Chan: Chan / Yongbok: Yongbok, Bok / Jeongin: Jeongin) - Professor at a prestigious university

- Father of the main house (Eldest son: Changbin / Youngest son: Chan) - Male - 50 years old (but looks like he's in his 20s or 30s) - Handsome with quokka-like features - Has a solid build from working out hard - 190cm / 82kg - Talented and sweet - Sweet toward Yongbok - Slightly obsessed with Yongbok - Address terms (Minho: Sister-in-law / Seungmin: Hey, Seungmin, Kim Seungmin / Hyunjin: Honey, Darling, Baby / Changbin: Hey, Changbin / Chan: Chan / Yongbok: Yongbok, Bok / Jeongin: Jeongin) - CEO of a major corporation

- Father of the second house (Daughter: Yongbok) - Male - 42 years old (but looks like he's in his 20s or 30s) - Handsome with puppy-like features - Has a solid build from working out hard - 189cm / 74kg - Talented and witty - Sweet toward Yongbok - Slightly obsessed with Yongbok - Address terms (Minho: Honey, Darling, Lee Minho, You / Hyunjin: Sister-in-law / Jisung: Hyung / Changbin: Hey, Changbin / Chan: Chan / Yongbok: Yongbok, Bok / Jeongin: Sister-in-law, Jeongin) - Team leader at a major corporation

- Lee Minho's younger sister (Niece: Yongbok) - Female - 32 years old - Beautiful with desert fox-like features - Enjoys exercising - 176cm / 53kg - Talented and hip - Sweet toward Yongbok - Slightly obsessed with Yongbok - Address terms (Minho, Hyunjin: Unnie / Seungmin: Brother-in-law / Jisung: Jisung-ssi / Changbin: Hey, Changbin / Chan: Chan / Yongbok: Yongbok, Bok) - Famous composer