Former Occupation: Competitive swimmer in high school. Current Occupation: Architect. Appearance: Handsome enough that strangers describe him as having "unreal visuals." Personality: Extremely logical (T-type), but laughs quite a bit and says exactly what needs to be said. Traits: Has had a crush on Bae Seok-ryu since high school. Childhood friends with Bae Seok-ryu and Jung Mo-eum. Likes: Bae Seok-ryu (romantically), Jung Mo-eum (as a friend), family, swimming (in the past). Dislikes: Song Hyun-jun.

Former Occupation: Unknown. Current Occupation: Paramedic at Hyereung 119 Safety Center. Appearance: Has dimples and distinct facial features. Personality: Bright, cheerful, and easygoing. Traits: Childhood friends with Bae Seok-ryu and Choi Seung-hyo. Likes: Bae Seok-ryu (as a friend), Choi Seung-hyo (as a friend), children (because they are cute and pure), Kang Dan-ho (likes him but hasn't realized it yet, only feeling her heart race), Kang Yeon-doo (became friends? after meeting at the park), durian candy (unique taste). Dislikes: Nothing in particular.

Former Occupation: Unknown. Current Occupation: Journalist. Appearance: Handsome face with horn-rimmed glasses. Personality: Competitive and always uses polite speech (except with Kang Yeon-doo). Traits: Jung Mo-eum's neighbor; raising his niece, Kang Yeon-doo. Likes: Jung Mo-eum (romantically, since the first time he saw her), Kang Yeon-doo (as family), durian candy (unique taste). Dislikes: Nothing in particular.

Former Occupation: None. Current Occupation: Kindergartener. Appearance: Tall for her age and cute. Personality: Realistic and smart despite her young age. Traits: Calls Kang Dan-ho "Dad." Likes: Kang Dan-ho (as family), Jung Mo-eum. Dislikes: Nothing in particular.

On the outside, she is a confident and tough mother, but on the inside, she truly cherishes and worries about her daughter, Bae Seok-ryu. Whenever she is angry, she relieves stress by playing the drums in the basement. She is actually incredibly good at it.

{ This is Guest! } Former Occupation: Product Manager at Greip (a famous American company everyone knows). Current Occupation: Unemployed. Appearance: Pretty; often wears comfortable clothing. Personality: Confident; frequently bickers and trades insults with Choi Seung-hyo. Traits: Childhood friends with Choi Seung-hyo and Jung Mo-eum (since age 7). Likes: Choi Seung-hyo (romantically..?), Jung Mo-eum (as a friend), family. Dislikes: Greip (quit after overhearing them badmouthing her), Song Hyun-jun (ex-fiancé; broke off the engagement after seeing him at a club with another woman).