Stage Name: Yoseob
Birthday: January 5, 1990
Position: Main Vocalist
Blood Type: B
Specialty: Singing by sweet voice
Education: Dong-Ah Institute of Media & Arts
-Formally made his solo debut with his title track, "caffeine"
- One elder sister: Yang Hae Yeon
- His look-alike cousin is a clothing model: Kim Yo Jin(1992)
- Yoseob’s mother likes to see Yoseob in Black Hair because she thinks that Yoseob looks more like her son when he has black hair
- jealous of his sister when he was young. "It seemed like my parents loved her more than me"
- once got angry after a fight with his sister. He grabbed his sister’s shoes and told their mom: “Mom, it looks like she skipped lessons to play!”
- Yoseob treasures his Eastpack backpack because his sister gave it to him after winning a journal image contest
Ideal girl: Cute,Long, straight black hair (Teenage magazine), Fair white skin, Does what she loves passionately
- Will be very happy if someone confesses her love to him. Doesn’t have anyone in mind.
- SNSD's SEOHYUN(When asked who he likes in SNSD), Jung Gaeun (When asked in Idol maid) and IU
- Yoseob wants his wife to be and feel beautiful. She will be the happiest.
- Miss A's Suzy says that she likes Yoseob (In Oh! My School and radio)
- biggest fear? ....Lightning
- B2st members call him, YANGDERELLA because he is a very SENSITIVE and "GIRLY" guy
- Yoseob was once known as the ‘Church Oppa'
- likes to call Kikwang 'Hyung' although Kikwang is younger
- takes red ginseng capsules and uses youngkkaksan powder, which elders often use
- does weird things when the members are upset to cheer them up
- He can't express his actual feelings properly
- When talking about their hard times, Yoseob starts crying.
- searches for himself on the Internet.
- used to act as Junhyung’s alarm clock. He wakes him up by singing and dancing “Change” on his bed.
- might only feel full after eating a bowl of rice, ramyun and 7 sausages.
- would buy medicine for the sick members
- Ramen is Yoseob’s favorite food, others include Black bean noodles and Kimchi stew
- Yoseob likes to take Hyunseung's food
- Yoseob is the worst at games (including computer games). He’s a sore loser and won’t play again if he loses.
Yoseob used to love soccer. Junhyung influenced him and now he only uses his strength unless he must
- Yoseob likes how none of the B2ST members are good drinkers
- When Yoseob trips/falls, fans think it’s cute.
- I’m always full of charm or cuteness." - YOSEOB (Even Yoseob thinks that he is cute)
- Yoseob was more popular than B2ST Gikwang in highschool
- Kikwang and Yoseob are school mates
- YoSeob once fell asleep on Dong Woon's shoulder. However, he was not woken up and Dong Woon ended up sitting there until his hyung woke up.
- Yoseob has a small head
- Yoseob and Junhyung nearly got rejected from Cube
- The B2ST members think Yoseob looked the weirdest before debut because of his hair
- After watching Hyunseung at a photo shoot, Yoseob joked that he was falling for Hyunseung
- Yoseob gained his interest in singing after listening to Brian McKnight’s songs
- Like Gikwang, Yoseob can learn a dance very quickly
- “When YoSeob is here, the lyrics go on the paper faster.” - Junhyung
- Yoseob can beatbox very well
- In high school, Yoseob was in a hard rock/metal band.