Koo Ja Sung

fans love
Koo Ja Sung - Biography, Profile, Facts, and Career

Koo Ja Sung is a South Korean actor and model. He’s best recognized for his appearances in drama series such as Misty (2018) and The Secret Life of My Secretary (2019).


Koo Ja Sung first started out as a model. He then tried out acting in 2007. For his debut, he got a role in the film Milky Way Liberation Front. At the time, this actor was only 15 years old.

Afterwards, he took a break from the entertainment industry for several years. He only came back in 2017. During that time, Ja Sung got a small role in the TV series titled The Blue Sea.

This Virgo man began to get some recognition around 2018. He played a supporting role in the TV series Misty.

In 2019, this actor found even bigger increase in popularity. He got one of the main roles in The Secret Life of My Secretary. This series helped opened up more acting opportunities for him.

In the next few years, Ja Sung continued to star in more TV series. He got to play as main characters on many occasions.

Some of his works can be found in Was It Love? (2020), Sponsor (2021), and Queen Maker (2021).

Read more: Kwon Nara – Biography, Profile, Facts, & Life Story


  • Real Name: Koo Ja Sung (구자성)
  • Stage Name: Koo Ja Sung
  • Nickname: Pottery
  • Birthday: September 22, 1992
  • Birthplace: South Korea
  • Zodiac Sign: Virgo
  • Nationality: Korean
  • Religion: –
  • Profession: Actor
  • Education: Dankook University Cheonan Campus (Practical Music)
  • Hobbies: –
  • Facebook: –
  • Twitter: –
  • Threads: –
  • Instagram: @koojas
  • Tiktok: –
  • Youtube: 오늘의자성
  • Weibo: koojas

Height, Weight, & Physical Appearance 

  • Height: 188 cm (6’2″)
  • Weight: –
  • Blood Type: –
  • Hair Color: Black
  • Eye Color: Black
  • Body Measurements: –
  • Shoe Size: –


  • Father: –
  • Mother: –
  • Brother: –
  • Sister: –

Girlfriend & Dating History

He has never been involved in any publicly disclosed romance nor rumored to date anyone. He most likely prefers to keep his personal and dating life out of the limelight.

Net Worth 

Even though he has never personally revealed the exact amount of his net worth, multiple sources estimated the number to be around $1 million to $5 million.

He seems to earn most of his income through working as an actor and model in the South Korean entertainment industry.

Plastic Surgery

There is no known information on whether he has undergone any cosmetic surgery to change his visual appearance.


  • The model-turned-actor is a signed talent under PLK Entertainment.
  • He came to Seoul after finishing his military service.
  • In 2018, he participated in the variety show Dunia: Into A New World.
  • This actor has been friends with Baro of B1A4 since elementary school.
  • From Baro, he got to know Yoo Yeon Seok and Son Ho Jun.
  • He picked Kim Young Kwang as the most respected model.
  • Many people said he resembles actor Park Hyung Sik.
  • He likes cooking.
  • He would like to be a chef.
  • Ja Sung wants to own a bakery or dessert cafe when he gets older.
  • He would love to partner up with Min Kyung Hoon in Knowing Bros.
  • He picks his enthusiasm as his strength.
  • This South Korean can roll one of his eyes while the other stays unmoving.
  • He also can put his earlobe inside the ear.
  • He would eat, exercise, or ride a bike when feeling stress.
  • This talented actor mostly wants to show cooking contents on his Youtube channel.
  • As a child, he wanted to play the clarinet after watching a concert.
  • In elementary school, he learned to play saxophone because of his uncle.
  • Ja Sung loves wearing street style outfit, such as Supreme, Fear Of God, and Ralph Lauren.
  • He likes minimalistic things.
  • He is the kind of person who sets out many goals.
  • His personality is ISFP.
  • He has met Hollywood actress Vanessa Hudgens in 2019.
  • This former model gets happy knowing people support him.
  • He loves listening to songs by French singer named Poom.
  • His ideal type is…

Read more: Yoo Ah In – Biography, Profile, Facts, & Life Story


  • Milky Way Liberation Front (2007), as a subway passenger

Drama Series 

  • Sponsor (iHQ, MBN | 2022), as Hyun Seung Hoon
  • Was It Love (JTBC | 2020), as Oh Yeon Woo
  • The Secret Life of My Secretary (SBS | 2019), as Ki Dae Joo
  • Room No. 9 (tvN | 2018), as security company employee (ep.2)
  • Misty (JTBC | 2018), as Kwak Ki Seok

TV Shows

  • Problem Child in House (KBS2 ⏐ 2018), as himself (guest)
  • Dunia: Into A New World (MBC ⏐ 2018), as himself (cast member)
  • Knowing Bros (JTBC ⏐ 2015), as himself (guest)


“I felt a bit nervous and excited coming to the set [of Sponsor] after having just been sitting and reciting lines during the script reading, but the senior actors took such good care of me and led me well that we were able to film amidst a great atmosphere.”

“Both being a model and an actor have different charms. If you’re a model, just dress in one look and you’re done. But if it’s an acting, it may take longer to prepare. I think it’s a different kind of charm. For one acting role, it may take a long time to prepare to get into the role. When the performance was finished, there was still some feeling that I was connected to that role.”

“Before, I never cared about acting. But now I really like acting. And I pay a lot of attention to it.”

“I never thought I had any talent in this area [of acting]. But I know that acting is something I do and I really enjoy it. Especially receiving compliments from viewers as well. It made me feel better about my performance even more.”

“I like the action genre. But now I’m starting to like watching dramas more. I [also] like to watch various documentaries.”

“Actually, I graduated with a major in classical music. If I wasn’t an actor, I would probably work in music. It’s probably jazz.”

Pics of Koo Ja Sung

1. Ja Sung always looks super cool

Koo Ja Sung - Biography, Profile, Facts, and Career

2. Love this kind of style on him

Koo Ja Sung - Biography, Profile, Facts, and Career

3. He can make any outfit works

Koo Ja Sung - Biography, Profile, Facts, and Career

4. His softer look is great as well

Korean Actor - Biography, Profile, Facts, and Career

5. Ja Sung in motion still looking perfect

Korean Actor - Biography, Profile, Facts, and Career


Who is Koo Ja Sung?

He is a South Korean actor and model.

Who is Koo Ja Sung’s real name?

His real name is Koo Ja Sung (구자성).

What makes Koo Ja Sung famous?

He’s famous because of his appearances in drama series such as Misty (2018) and The Secret Life of My Secretary (2019).

Where is Koo Ja Sung from?

He was born in South Korea.

How old is Koo Ja Sung?

He was born in 1992, and he is 32 years old as of 2024.

When does Koo Ja Sung celebrate his birthday?

He celebrates on the 22nd of every September.

How tall is Koo Ja Sung?

His height is 6’2″ or 188 cm.

Who are Koo Ja Sung’s parents?

He did not reveal the names of his father and mother.

Is Koo Ja Sung married?

He is not married. Furthermore, there is no information on whether he is in a relationship or not.

Who is Koo Ja Sung’s ex-girlfriend?

His ex-girlfriend is not known.

How rich is Koo Ja Sung?

His net worth is around $1 million to $5 million.

What is Koo Ja Sung’s nationality?

His nationality is South Korean.

Koo Ja Sung has steadily grown into mainstream popularity in the last few years. It is exciting to see his growth in the next projects.