- She is the shortest member of Twice.
- She wrote the rap in Twice's remake of the song "Precious Love" by Park Ji Yoon.
- She participated in "Eye Eye Eyes" from the mini-album Signal with Jihyo in writing lyrics
- She wrote two songs for their full length-album Twicetagram: ''Don't Give Up'' and ''Missing U'', the last one along with Dahyun.
- She and Jeongyeon also took part of the writing of ''Sweet Talker'' from the mini-album What is Love.
- She thought that she'll grow tall because she has long fingers.
- She told her friends to walk around with linked arms because she will grow, but she never grew.
- She loves to draw. She is the best drawer among the members. Her drawing is used in her limited edition album and Spris shoes.
- Her blood type is one of the rarest in the world, as it is B-.
- Her favorite Pokémon are Togepi, Pikachu and Eevee.
- She resembles a character from the Disney movie The Lion King called Simba, which gave her the nickname, "Baby Lion".
- She loves Sesame Street and has a collection of the character toys in her room.
- She always plays the same thing/order for Rock-Paper-Scissors. She tries to change but never does.
- She has a mole below the left corner of her lips, which is a significant feature of how people recognize her.
- She can imitate duck and window wiping sound.
- She is shy when singing in front of the other members even though her singing is as good as her rapping.
- She doesn't like beans. Nayeon makes fun of her because of that.
- Her religion is Catholic. Her Baptismal name is Katarina.
- She once ate udon while hiding under a desk. It got caught on camera and she got scolded for it.
- She sleeps the most. She usually sleeps without eating.
- Her childhood nickname is called "Strawberry Princess" because she loves strawberries.
- She doesn't use neck pillows because it keeps falling off.
- She likes basketball.
- She likes healthy foods like veggies but doesn’t like sweets.
- She and TZUYU often sing PPAP. (Pen-Pineapple-Apple-Pen – PPAP Song)
- She likes Disney cartoons.
- When she can’t sleep, she listens to music, uses her phone, uses the dictionary, and thinks.
- Cosmic Girls’ Yeoreum and her were schoolmates in middle school and became friends.
- She and Nayeon did ballet when they were younger. They just didn’t learn it long enough to be good at it.
- She and Dahyun are in charge of washing the dishes at the dorm.
- She said she is going to get a driving license as soon as she turns into an adult.
- She was a girl scout during elementary school.
- When she was in middle school, her mobile phone background was Justin Bieber.
- Her zodiac sign is Taurus.
- Her Chinese zodiac sign is Rabbit.
- She can do an impersonation of Togeworl’s Kim Yerim.
- In the dorm, the maknae line, Dahyun, Tzuyu and her share a room.
- She is close to Jinsol from April, because they was in the same class since high school.
- Jeongyeon and her are called the No Jam Brothers, because they always make the coldest jokes.
- She is close friends with Somi, a former member of the band I.O.I, and also competed in Sixteen, but Somi didn't debut with Twice.
- It took Chaeyoung 2.5 years to pass the JYP basic routine dance exam.
- She is pretty close with Rosé from BLACKPINK. Both their Korean name is Chaeyoung, but the Hanja are different.
- She cut her hair short after seeing Kristen Stewart without telling anyone. The company told her to at least tell if she wants to do something like that.
- She said she is going to get her driver’s license as soon as she turns an adult.
- She regrets cutting her hair short, and decided to wear hair extension.
- Jihyo once used her 4 collaged picture from VLive screenshot as profile picture because she thinks she's so handsome with short hair, which Red Velvet's Yeri said it as well.
- being fluent in English is one of her criterias for her boyfriend.
- Soompi named her one of the Kpop Idols with gorgeous 90 degree shoulders. Article
- TMI: “I made my nails long too.” Article
- Chaeyoung has 4 tattoos at the moment: tomatoes on her left arm, carrots on her left forearm, "shot through the heart" on her neck, strawberry lips on her wrist.[1]
- She is a fan of Justin Bieber.
- She is a fan of Timothee Chalamet