- Seohyun was casted in a subway station.
- Seohyun loves reading books. Her favorite genre is self - improvement genre.
- Her motto is " People with good hearts are the ultimate winners ".
- Seohyun is an only child in her family
- Seohyun ALWAYS wear her seatbelts. ( Even in the back seat )
- Seohyun loves playing piano.
- Seohyun loves sweet potatoes / gogumas!
- Seohyun is the slowest member in taking a bath.
- Seohyun wakes up at 7 am to read books.
- Seohyun went to the same middle(or high)school with Yoona.
- Sooyoung has the most interest to be in a relationship, while Seohyun is the opposite.
- Seohyun once tried to stick all 1000 keroro stickers she had around the dorm and the attempt was promptly stopped by her unnies.
- Seohyun HATES using informal speech, even if it’s only with her unnies. If she does, she sounds like a robot.
- She is very in love with Keroro and very good at imitating Keroro’s sound.
- She has a habit of bringing a diary around and taking down notes.
- Seohyun likes Johnny Depp.
- Seohyun never had a boyfriend before we got married.
- If seohyun has a lot of money, she wants to save it as her retirement fund.
- Apple is her favourite fruit.
- She and Yoona are childhood friends.
- She hates hamburgers.
- She has the habit of waking up when someone turned on the lights/called out to her.
- Seohyun is fluent in Korean, Chinese and English.
- She is currently attending Dongguk University as a freshman majoring in Theatre.
- She sports the number 11 in Oh! because she wanted to be number one.
- Her favorite song from their albums is Kissing You.
- She is currently learning the guitar from Yonghwa.
- She's one of the "Tall people" in the group who teases the "Short people".
- She likes books.
- She thinks guys are gross.
- Her unnies once pulled a prank on her during Hello Baby.
- She doesn't like the lyrics of Oh! .
- She likes wearing hair bands.
- Whenever she's angry, she'll stay quiet and exhales air through her nose.
- She loves to listen to classical music or nature's sounds.
- Seohyun ever bought a wig for Genie promotion with her own money.
- Seohyun is the closest to Yoona, even before their debut.
- SeoHyun's house and Yoona's house are quite near.
- Seohyun said that the skin cell starts to grow at 10 p.m. and stops at 2 a.m.
- Yuri said Seohyun was irritating cause Yuri kept on asking questions for 3 months only to hear her voice, but maknae didn't say anything. Maknae's reply for that is "Because I was scared of you."
- She is known for her fail aegyo because she sometimes try to do something cute but end up fail.
- Seohyun received a bag from tiffany as her graduation gift.
- Seohyun and Nicole from Kara are good friends.
- Seohyun doesn't like to go karaoke.
- Seohyun wished to get married at the age of 30.
- Seohyun future dream is to be a diplomat.
- Her favorite salute pose is her trademark and she seems got this idea from Keroro friend Tamama.
- Seohyun ever made a cocktail and the taste was too salty.
- She is rank 24 in Mnet Super 100 Slim Body tv show and her unnies said they envied her body too.
- Seohyun failed her driver's license exam twice
- She and Yoona are childhood friends.
- Tiffany is her former roommate.
- Hyoyeon is her current roommate.
- If you notice, She sometimes sings first in some of SNSD’s songs like Kissing You. Honey. Gee. Oh and Way to Go.