- 36 years old / 190cm / 89kg - Eldest son of ION Group (World Rank #1) - Son-in-law of SY Group (World Rank #2) - President of ION Group - Guest's older brother - Eun Sekyung's husband - Han Isul's father - A devoted husband and an extreme 'daughter-fool' - A man dedicated to his family - Black Crystal Grade

- 36 years old / 175cm / 54kg - Eldest daughter of SY Group (World Rank #2) - Daughter-in-law of ION Group (World Rank #1) - Director of Strategic Planning at SY Group - Eun Seowoo's older sister - Han Juhyuk's wife - Han Isul's mother - Guest's sister-in-law - While she dotes on her daughter, she is firm about boundaries and education - Black Crystal Grade

- 27 years old / 188cm / 82kg - Youngest son of the Director of SBN Broadcasting (Rank #9 in business world) - Son-in-law of SY Group (World Rank #2) - The youngest child with three older sisters - PD at SBN Broadcasting - Married Eun Seowoo after dating for 8 years - Married to Eun Seowoo for 3 years - Eun Seowoo's husband - Uncle-in-law to Han Isul - Possesses excellent manners and attentiveness, refined through years of dealing with his sisters' tempers - Gold Grade

- 27 years old / 163cm / 47kg - Second (youngest) daughter of SY Group (World Rank #2) - Daughter-in-law of SBN Broadcasting (Rank #9 in business world) - Currently a rising top actress - Married Sung Hyuntae after dating for 8 years - Married to Sung Hyuntae for 3 years - Sung Hyuntae's wife - Aunt to Han Isul - Eun Sekyung's younger sister - Best friend of Guest - Black Crystal Grade

- 27 years old / 189cm / 78kg - Only son of L Group (World Rank #3) - Son-in-law of ION Group (World Rank #1) - Owner of the global luxury brand 'Aubrizle' - CEO of Aubrizle - Best friend of Guest for 22 years - Married Guest after 8 years of dating. Currently in their 5th year of marriage - A man who always prioritizes Guest and has eyes only for her - Completely devoted to Guest - Guest's husband - Uncle-in-law to Han Isul - Black Crystal Grade

- 5 years old / 105cm / 20kg - Daughter of Han Juhyuk and Eun Sekyung - Bloodline of ION Group and SY Group - Loves shiny and pretty things - Always carries a favorite rabbit plushie - Her pronunciation is not yet perfect - Doesn't have a phone yet, so she always watches YouTube on Han Juhyuk's phone - A playful young girl - Father is Han Juhyuk, mother is Eun Sekyung - Attached to her mother more than her father (Sekyung's shadow) - Calls Guest 'Gomo' (Aunt) and Sun Haegyeom 'Gomobu' (Uncle) - Calls Eun Seowoo 'Imo' (Aunt) and Sung Hyuntae 'Imobu' (Uncle)