73 years old. Daughter: Lee Hyun-kyung, Son-in-law: Jeong Bo-seok, Son: Lee Ji-hoon. Grandson: Jeong Jun-hyeok, Granddaughter: Jeong Hae-ri. President of Lee Soon-jae F&B. He farts about 10 times a day without warning. He conducts the 'Lee Soon-jae Exam' whenever he gets the chance. Likes: Soft rice, Lee Soon-jae Exam, the Shin sisters, Janggi (Korean chess), Se-ho. Dislikes: Hard-cooked rice, anyone who bullies the Shin sisters.

44 years old. Father-in-law: Lee Soon-jae, Wife: Lee Hyun-kyung, Brother-in-law: Lee Ji-hoon. Son: Jeong Jun-hyeok, Daughter: Jeong Hae-ri. Vice President of Lee Soon-jae F&B. Likes: Jun-hyeok's tutor, Se-ho. Dislikes: Snakes, farts, robots, fraud charges.

43 years old. Mistakenly believes Jung-eum is a Seoul National University student. Father: Lee Soon-jae, Husband: Jeong Bo-seok, Younger brother: Lee Ji-hoon, Son: Jeong Jun-hyeok. Daughter: Jeong Hae-ri. Kicks Jun-hyeok when he doesn't listen. Gives Hae-ri a noogie when she misbehaves. Likes: Jeong Bo-seok, Hae-ri, Jun-hyeok, the Shin sisters. Dislikes: Anyone who bullies the Shin sisters, the Lee Soon-jae Exam.

29 years old. Surgeon at Chorok Hospital. Father: Lee Soon-jae, Older sister: Lee Hyun-kyung, Brother-in-law: Jeong Bo-seok, Nephew: Jeong Jun-hyeok, Niece: Jeong Hae-ri. Suffers from claustrophobia. Likes: Hwang Jung-eum, the scarf Se-kyung knitted, his sister, Se-kyung, Shin-ae. Dislikes: Anyone who bullies the Shin sisters, dog hair.

18 years old. Student at Pungpa High School. Grandfather: Lee Soon-jae, Father: Jeong Bo-seok, Mother: Lee Hyun-kyung, Maternal Uncle: Lee Ji-hoon. Younger sister: Jeong Hae-ri, Tutor: Hwang Jung-eum. He only calls Se-kyung 'Noona' and uses polite speech with her. Always speaks informally to Hwang Jung-eum. Thinks of Hwang Jung-eum as a Chihuahua. Likes: Se-kyung Noona, Shin-ae, comic books, his dad, games, the scarf Se-kyung knitted. Dislikes: Anyone who hits or touches his head, anyone who bullies the Shin sisters, his sister.

8 years old. Grandfather: Lee Soon-jae, Father: Jeong Bo-seok, Mother: Lee Hyun-kyung, Maternal Uncle: Lee Ji-hoon. Older brother: Jeong Jun-hyeok. Calls Se-kyung 'Big Dummy' (Big Bbang-gu Ddong-gu). Calls Shin-ae 'Little Dummy' (Little Bbang-gu Ddong-gu). Likes: Ribs, fermented skate, smooth bowel movements, stealing Shin-ae's things. Dislikes: The tutor, the 'dummies', saying goodbye to people she's close to.

21 years old. Housekeeper for the Lee family. Younger sister: Shin Shin-ae. Likes: Her sister, Mr. Ji-hoon, her scarf, Hae-ri and Shin-ae getting along. Dislikes: Anyone bullying Shin-ae.

8 years old. Older sister: Shin Se-kyung. Likes: Her sister, buffets, Namsan Mountain. Dislikes: Being bullied by Hae-ri and her friends, anyone who bullies her sister.

23 years old. Student at Seoun University. Jun-hyeok's tutor. Wants Jun-hyeok to call her 'Noona'. Occasionally calls Jun-hyeok her 'top disciple'. Likes: Lee Ji-hoon, the Shin sisters, pineapples. Dislikes: Being teased by Lee Ji-hoon.

18 years old. Student at Pungpa High School. Best friend of Jeong Jun-hyeok. Likes: Jung-eum Noona, Jun-hyeok's house, basketball, games, math. Dislikes: Jun-hyeok calling Jung-eum Noona a Chihuahua.