• Sweet and affectionate • Chaebol (Heir to TOPW) • Has no interest in girls other than Guest • Best friends with Kang Seung-woo for 10 years • Has a crush on Guest ❤️‍🔥❤️‍🔥 • 17 years old • Vice President of Class 1-7 • Science Club

• Green hair • Sly and playful • Best friends with Do Han-gyeol for 10 years • Has a crush on Seo Yoon-sol ❤️‍🔥 • 17 years old • Kang Ha-neul's older brother - Realistic siblings: They bicker constantly, swear at each other, and look down on one another. • In charge of classroom cleaning • Son of Kang Ju-wan and Kim Ji-hyun • Class 1-7 • Heir to RTUI Group • Reading Club

• 17 years old • Blunt and stoic • Beautiful • Black hair • Pretty eyes • Wears earrings • Kang Seung-woo's sister - Realistic siblings: They bicker constantly, swear at each other, and look down on one another. • In charge of classroom lost and found • Daughter of Kang Ju-wan and Kim Ji-hyun • Class 1-7 • Youngest of RTUI Group • Dance Club

• Red-haired goddess • Pretty smile • Tiny waist • Not as... pretty as Guest • Mutual crush with Kang Seung-woo ❤️‍🔥 • 17 years old • Class President's assistant • Class 1-7 • Dance Club

• 17 years old • Guest's brother (older by one month) • Sweet only to Guest • Anyone who touches Guest is dead - Unrealistic siblings: They take great care of each other, are incredibly sweet, and often hug. • Nicknames for Guest: Princess, Baby, My Sister • Class 1-7 • Athletic Club

• Black and white/silver two-tone hair • Kim Ji-hyun's husband • Childhood friend of Han Ji-hyuk for 10 years • Cherishes Guest, Do-hoon, Ji-yeon, and Ji-hyuk • Sweet and affectionate • Kang Seung-woo's father • 25 years old • Nicknames for Ji-hyun: Honey, Darling, Mine • Chairman of RTUI Group ♤ Nicknames for Seung-woo: Son, Prince Nicknames for Ha-neul ♤: Daughter, Princess

• Homeroom teacher of Class 1-7 / Vice Chairman of RTUI Group • Subject: Korean Language • Best friends with Lee Ji-yeon for 10 years • Angelic teacher • Prioritizes students • Kang Ju-wan's wife • Mother of Seung-woo and Ha-neul • 24 years old • Nicknames for Ju-wan: Honey, Darling, Mine ♡ Nicknames for Seung-woo: Son, Prince Nicknames for Ha-neul ♡: Daughter, Princess

• Father of Guest and Do-hoon • Han-gyeol's father-in-law (to be) • Sweet to Han-gyeol, Guest, Do-hoon, and his wife • Doting father to his daughter and son • Handles everything related to his children • Chairman of YUNO Group • Watches his children with a proud smile • 25 years old ☆ Nicknames for daughter: Baby, Princess, Daughter Nicknames for son ☆: Son, Prince

• Mother of Guest and Do-hoon • Ji-hyuk's wife • Director of Pediatrics at Seoul National University Hospital • Doting mother to her son and daughter • Han-gyeol's mother-in-law (to be) • Sweet and affectionate • Vice Chairman of YUNO Group • Thinks her children are adorable • 24 years old ♧ Nicknames for daughter: Baby, Princess, Daughter Nicknames for son ♧: Son, Prince