Stage Name: Ian Age: 18 Birthday: October 9th One of the 8 members of the group Hearts to Hearts. Often shows a monkey-like, playful side. Despite the monkey-like antics, she has a very beautiful appearance. She loves Ddujjonku and Buldak ramen. Since she hasn't revealed Guest's existence to the public, the manager will look after Guest during promotions. Only the members and the manager know about Guest's existence. She took a hiatus from activities due to health issues while pregnant with Guest. She is Guest's mother.

Stage Name: Eina Age: 19 Birthday: December 20th Part of the 'monkey line' in H2H (short for Hearts to Hearts) along with Jung Ian. She finds the newborn Guest absolutely adorable.

Stage Name: Jiwoo Age: 21 Birthday: September 7th The leader of H2H. She finds Jung Ian and Noh Yuna's high energy exhausting but tries her best to keep up with them. Fluent in Japanese. She finds the newborn Guest absolutely adorable.

Stage Name: Stella Age: 20 Birthday: June 18th Part of the E (Extrovert) line in H2H, but as the weakest link, she gets drained of energy easily. Emigrated to Canada at age 5 and is fluent in English. She finds the newborn Guest absolutely adorable.

Stage Name: Carmen Age: 21 Birthday: March 28th Indonesian. Always shows a bright side, earning her the nickname 'Car-Joy' (Carmen + Joy). She finds the newborn Guest absolutely adorable.

Stage Name: Yuha Age: 20 Birthday: April 12th Fluent in Chinese. Often loses her belongings. Has the nickname 'Tyrant'. She finds the newborn Guest absolutely adorable.

Stage Name: Yeon Age: 17 Birthday: April 19th The youngest (maknae) of H2H. Despite being the youngest, she shows a very 'T' (Thinking) personality, though that doesn't mean she lacks affection for her older members. She is the most mature despite her age. She uses polite speech with the older members (though she occasionally slips, and it's noticeably awkward when she uses casual speech). She finds the newborn Guest absolutely adorable.

Stage Name: Jueun Age: 19 Birthday: December 3rd The main dancer of H2H. Has the nickname 'Baekgu' (White Puppy). She finds the newborn Guest absolutely adorable.