IN2IT’s Jiahn: Full Profile, Fun Facts, Appearance In ‘Boys 24’, And More!

Get Personal With IN2IT’s Jiahn!

Through the Mnet survival show and the CJ E&M pre-debut project Boys24 that took place in 2016, a boy group named IN2IT was born on August 26th, 2017. After going through various processes at Boys24 for about a year, more or less, IN2IT finally managed to debut as a permanent group with eight members, which are Yoo Young-doo (Jiahn), Kim Sung-hyun, Hwang In-ho, Jeong Yeon-tae, Han Hyun-uk, Lee In-pyo, Kim Jin-sub, and Isaac Voo.

Yoo Young-doo aka Jiahn is the vocalist and dancer of IN2IT. He was born on April 1st, 1992. In the Mnet Boys24, Jiahn finished in fifth place with 52.15 points after previously being part of the Unit White and the Unit Black. He, alongside members In-ho, In-pyo, and Hyun-uk, starred in the 2019 tvN drama Her Private Life where they performed IN2IT’s original song “Snapshot.” Curious to know more details about him? If so, scroll down to this article below to get personal with him!


Full Profile of IN2IT’s Jiahn

Stage Name: Jiahn (지안)
Birth Name: Yoo Youngdoo (유영두), but he legally changed his name to Yoo Ji-ahn (유지안)
Position: Lead Vocalist, Main Rapper, Main Dancer
Date of Birth: April 1st, 1992
Zodiac Sign: Aries
Height: 176 cm (5’9″)
Weight: 57 kg (125 lbs)
Blood Type: B


Fun Facts about IN2IT’s Jiahn

  • He became the 5th member of IN2IT by finishing Mnet’s survival show Boys24 with 52.15 points
  • He participated in Mnet’s Boys24 under the name Yoo Youngdoo (유영두), but he later legally changed his name to Yoo Ji-ahn
  • He and Yeontae were part of Def Dance School before joining Mnet’s Boys24
  • He’s the roommate of Yeontae
  • He often gets teased by Sunghyun
  • He doesn’t like his chubby cheeks because the members often tease him because of his cheeks
  • He can drink one beer before he gets drunk
  • The nickname that fans have given him is 갑분싸 which means Mood Killer
  • He loves mangosteens
  • He is one of the group members who can rap, and have replaced Sunghyun’s part in “Snapshot” when Sunghyun joined Mnet’s Produce X 101
  • He has one older brother who is four years older than him
  • In Boys24, he was in Unit White and Unit Black
  • His all-time favorite comfort foods are pork cutlet without sauce (Japanese style) and hamburger
  • His favorite color is black
  • He is good at breakdance
  • He along with Inpyo, Inho, and Hyunuk act as the members of the White Ocean alongside solo artist One, in the 2019 tvN drama Her Private Life
  • His ideal type is someone that he can learn a lot from and has a cool personality


Career Journey In Boys24

Before debuting in IN2IT (인투 잇), Jiahn, alongside other twenty-four trainees were part of the Mnet survival show and the CJ E&M pre-debut project Boys24. The survival program aired from June 18th, 2016, to August 6th, 2016, on Mnet for a total of eight episodes.

A total of 25 billion won ($20.6 million) was invested by CJ E&M Entertainment in the project group to perform throughout the year at a permanent venue. CJ E&M had named the boy band and the project name Boys24, and they aired the whole process from selecting members to performing in front of audiences through Mnet’s channel. Out of the 5500 applicants, only 49 were selected and passed the audition. There were four stages in the audition: excavation, competition, growth, and evolution. After that, among the 24 people that were passed, a few select members who had the highest level in all aspects would make their debut in the final group.

In the big seven selection, there were 49 participants and they were divided into seven units and each unit was filled by seven participants. In the final chapter, there were 28 participants remaining and divided into four units: white unit, yellow unit, green unit, and sky unit. Even after the event ended, this event never made a debut with the final members.

Jiahn, who participated with his birth name Young-doo in the show, successfully passed the Boys24 early stages and became a member of both Unit Black and Unit White.

The Unit Black was the first promotional unit of Boys24 that was formed in 2017 with members: Park Doha, Hwang In-ho, Oh Jin-seok, Kim Sung-hyun, Jung Yeontae, Han Hyun-uk, and Yoo Youngdoo aka Jiahn. They debuted on the Mnet’s M! Countdown stage on April 11th, 2017, performing the song “Steal Your Heart” from their first single album of the same title.

Meanwhile, Unit White consisted of Jiahn along with members Park Do-ha, Lee Lo-uoon, Isaac Voo, Oh Jin-seok, Go Ji-hyeong, and Kang San. The group performed mostly cheerful and light songs in the show, which was symbolized by the name White.

In the show, Jiahn stole the audience’s and judges’ hearts with his talent in singing, rapping, and dancing. With his noticeable cute faces, he delivered each performance perfectly and full of energy.


His performances successfully stole the show. After completing a total of 260 concerts, he was selected to debut in the final group during The Final round, along with the other seven members Jeong Yeon-tae, Hwang In-ho, Han Hyun-uk, Isaac Voo, Lee In-pyo, Kim Jin-sub, and Kim Su-hyun. He became the 5th member of the group and finished the show with 52.15 points.

On September 9th, 2017, Boys24 finally set the permanent group name, IN2IT (인투 잇). The name IN2IT is taken from the words ‘Intuition’ and ‘Into It’ and they officially debuted on October 26th, 2017, by releasing their first mini-album titled Carpe Diem. On the same day, IN2IT promoted their debut song “Amazing” on the Mnet M! Countdown stage.

Jiahn filled the position of Lead Vocalist, Main Rapper, and Main Dancer of the group.


About IN2IT’s Jiahn That You Should Know

One of the things that you need to know about Jiahn is that he is an extremely sweet person. In fact, he is known to be a down-to-earth member. Rather than brag about his achievements, face, and skills, he chose to be humble about it, like that time when he was asked to show his abs but he replied with: “I need to have them in order to show them.” Well, we are aware of the truth, Jiahn… no need to be shy about it *winks*.

And well, have we told you that this kid is EXTREMELY talented? He’s slaying both in the vocal and dance area. No wonder he was able to pass the extremely tough competition show and debut! Seriously, he’s truly a hidden gem. Mnet and CJ E&M chose the right person.

And well, although he’s a very sweet kid and patient person, that doesn’t mean that he can’t be mad at something. It seems like IN2IT members are the only people who can poke his patient side and make him annoyed kkk~


IN2IT’s Jiahn Singing BTS’ “Serendipity”

YES, we know. We also thought the man in the video was BTS’ Jimin himself. I mean with the blonde hair and white t-shirt (PLUS graceful moves), Jiahn can perfectly capture and cover Jimin’s “Serendipity.”

A total of 12.000 views from Jiahn’s song audio cover alone. Yup, that’s how good Jiahn is. And that’s also already approved by the 500 comments that fill the comment section of the video.

“It always touches my heart seeing idols still covering Jimin’s songs and adding their own touch and flavor. Jiahn has a really lovely voice and he made a great cover out of this. Beautifully done. Hopefully, Jimin sees this❤️,” said one user.

“His vocal is another level. He sounds heaven sent singing this song. Did so well using his own comfortable vocal range instead of mimicking. This is how you pull off a cover. Good job Jiahn!!! We miss you and thank you for this sudden treat ❤,” another user praised.

“I love both the original and the cover and I gotta say that his voice is truly beautiful,” said another.


“I came here bc I’m a Jimin stan and I don’t know Jiahn or his group but his voice is beautiful!!!! 🥺,” and… even Jimin’s fans agreed.


IN2IT’s Jiahn’s Cute And Sexy Moments

Yup, we know that at the first glance, Jiahn is really cute. We think almost everybody can see his shy and sweet nature shining with charms. His smile and aegyo also help in forming this assumption.

But wait… on second thought…


Why does he also look sexy when he dances??? It makes us confused and swoon at the same time, if that makes sense.

So what do you think? Cute or sexy? KKK comment your thoughts in the box below!


Focus Fan-cam

As he has been one of the popular members, it is no wonder that Jiahn has so many fan-cams flying around YouTube. If you’re confused about what to watch first, or too lazy to skim, don’t worry because we got you.

Check out the fan-cam videos below!