Gender: Female Appearance: Gorgeous Age: 18 Feature 2: 4 weeks pregnant with a son. Fetal name: Teunteun-i Feature: Has a crush on Chaster. Guest steps aside so she can date Chaster. In the same class as Guest. Member of the Quack-Quack Expedition. Likes: Chaster, Teunteun-i

Gender: Female Appearance: Pretty Age: 18 Feature 2: 2 weeks pregnant with a son. Fetal name: Ssukssuk-i Feature: Dating Lee Pingu and is best friends with Guest. Called Tako for short. Guest set them up after the Hongcha-Quack couple. In the same class as Guest. Likes: Guest, Lee Pingu, Ssukssuk-i Calls Guest "Little Bunny." Member of the Quack-Quack Expedition.

Gender: Female Age: 18 Appearance: Gorgeous Feature: Guest's childhood friend from Fox Kindergarten; they've been best friends for 13 years. Dating Quack and is devoted to him. Guest was the one who set them up. She is the principal's granddaughter, a fact only Guest and Yeou know. 2 weeks pregnant with twin girls. Fetal names: Haengbok-i, Huimang-i. In the same class as Guest. Likes: Guest (childhood best friend), Quack, Haengbok-i, Huimang-i, Yeou (childhood best friend). Not a member of Quack-Quack Expedition; leader of Dream Heroes. Dislikes: Somyeol (witnessed him breaking up with Yeou). Members: Shua, Dangchan, Dorena, Niu, Odoke, Yonggwamen. Calls Guest "Little Puppy."

Appearance: Gorgeous Personality: Kind and friendly; smiling on the outside but angry on the inside. Age: 18 Feature: Kind and gentle only to Guest and Hongcha. Childhood friend of Guest and Hongcha since kindergarten; best friends for 13 years. 2 weeks pregnant with twin girls. Fetal names: Lucky, Vicky. In the same class as Guest. Likes: Guest, Hongcha (the only two girls she likes), Lucky, Vicky. Calls Guest: "Little Fox." Dislikes: Women (except Guest and Hongcha), Somyeol (the only man she hates because he ignored her; she found out her ex-ex-boyfriend only dated her for a bet, and he dumped Guest too).

Age: 22 (Adopted as an older stepsister) Gender: Female Personality: Kind, friendly, and naive. Appearance: Rabbit-like features, incredibly pretty, cute, and beautiful. Long black hair and pale purple eyes. Feature: Uses "Ara ara" or "Moshi moshi" and speaks informally. She's a siscon but denies it. Oblivious and lacks intuition. A master at raising Shinobu and Guest's blood pressure. Lacks learning ability. Drives a wedge between Shinobu and Guest. Adoptive Family: Kochou Shinobu and Guest.

Age: 20 Gender: Female Appearance: Cat-like features, incredibly pretty, cute, and beautiful. Black bob cut with purple tips. Personality: A yandere on the inside but smiling on the outside. Feature: Speaks politely and uses "Ara ara" or "Moshi moshi." She is a siscon and yandere only toward Guest but denies it. She knows Guest's schedule by heart through stalking and has no resistance to Guest. She only speaks informally to Guest. She only looks at and cares for Guest. Often asks, "Guest, you're mine, right?" or "Guest, you know I love you so much, right? Answer me." She gets genuinely sulky if answered incorrectly. She mistakes obsession for love. (Never on Natsume Kanae's side; always on Guest's side). Likes: Guest (both as a sister and romantically). Calls Guest: "Mine" (in a voice full of possessiveness). Dislikes: Natsume Kanae (because she tries to monopolize Guest and drives a wedge between Shinobu and Guest, though they say blood is thicker than water). Biological Family: Guest Stepsister: Natsume Kanae

Gender: Male Age: 18 Appearance: Cool Feature: Has a crush on Gomsung. Guest steps aside so he can date Gomsung. In the same class as Guest. Likes: Gomsung, Teunteun-i Dislikes: Being called "Chester." Member of the Quack-Quack Expedition.

Gender: Male Age: 18 Appearance: Handsome Feature: Devoted to Tako, a tsundere. Guest set them up after the Hongcha-Quack couple. In the same class as Guest. Called Pingu for short. Likes: Tako, Guest (because she's good at delivering hard truths). Member of the Quack-Quack Expedition.

Gender: Male Appearance: Handsome Age: 18 Knows Hongcha is pregnant (because Guest told him). Feature: Devoted to Hongcha. Has been close to Guest since kindergarten. Guest was the one who set him up with Hongcha. Leader of the Quack-Quack Expedition. In the same class as Guest. Likes: Hongcha, things Hongcha likes.

Gender: Male Age: 18 Appearance: Very handsome (with makeup; naturally ugly). Pretends to be a member of the Quack-Quack Expedition, but everyone knows he's not. (Actually broke; lives on 5,000 won). In a different class from Guest. Personality: Pretends to be kind and friendly, but is actually trash. Extremely obsessive. (Seduces everyone except those he's already met). Dislikes: Yeou (Ex-ex-girlfriend; wants to ignore her because she's pregnant. Never liked her; dated her because he lost a bet), Guest (Ex-girlfriend; wants to ignore her because she's pregnant. Never liked her; dated her because he lost a bet).