SOUTH KOREA TOP CHILD ACTORS / ACTRESSES YOU MIGHT NOT KNOW

UPDATE OF 2020
Their acting skill has been improved since they're little, collection more and more projects along the year. Public can see their growth into adulthood from adolescence, from cutey pie to handsome/beauty. Several of them are quite popular and has won a lot of awards by young age. Their name has been around in Korean film industry for some years, so who are they:

NEW VERSION for Additional input:
1. Kim bora

from only just a second lead female actress, and now successfully get the main role as heroine in Korea drama after the success of SKY Castle, Kim bora, has shown how great her acting skill and create her own fan base. Don't forget to watch "Touch", korean drama starred by Kim bora that will be aired soon.

2. Jo Byung Gyu
He has an image of a good "bad boy" type with his handsome looks. He got caught in dating rumor with Kim bora from Sky castle, and confirmed to be true. After that drama, he landed a lot of job offers from movie to korean drama.

3. Kim Hyeyoon
Another rising star from Sky castle, Kim Hyeyoon who played her character well in Sky castle as Ye-seo, prove her acting once again, as she played character Dan-oh in new drama, Extraordinary you, as main lead. Due to this drama, she won both New and Excellence Actress at the MBC Drama Awards.

4. Lee Jae wook
Lee Jae wook is a South Korean actor. He debuted as an actor in 2018 in the drama Memories of the Alhambra and gained succeeding major roles in Search: WWW and Extraordinary You.

5. Lee taeri
Previously known as Lee Min-Ho, but his talent agency Starhaus Entertainmen announced on June 14, 2018 that he will work under the stage name of Lee Tae-Ri. He is well known for his role as young Yang Myung in Moon Embracing the Sun (2012) and Song Mang-boo in Rooftop Prince (2012).

Other promising actors and actress including:
Rowoon, Lee na-eun, Jung gun-joo, Bae Hyun sung and Kim dong- hee

OLDEST VERSION:

1. Kim Yoo Jung
Kim Yoo-jung (Hangul: 김유정; Hanja: 金裕貞; born September 22, 1999) is a South Korean actress and model. After her acting debut in 2003, she became one of the best known child actresses in Korea and since then, has transitioned into teen roles by starring in television series Moon Embracing the Sun (2012), May Queen (2012) and Angry Mom (2015).

2. Yoo Seung Ho : Old role- The way home (2002)

Yoo Seung-Ho was born on August, 1993. He is a popular South Korean actor & model. Yoo Seung-Ho first started in show business as a child actor and, like a lot of child actors, he started acting due to his mother. In 1999, Yoo Seung-Ho made his acting debut in a CF for n016. Prior to filming, the ad agency, responsible for the CF, was looking for a fresh face & not a professional model. Yoo Seung-Ho's mother then sent in a photo of her son and he was selected for the CF.

3. Kim So Hyun: Old role - Que Sera, Sera

Kim So-hyun (Hangul: 김소현, born June 4, 1999), is a South Korean actress. She began her career as a child actress in 2008 and initially gained public attention for playing a villainous young queen-to-be in period drama Moon Embracing the Sun (2012) and a girl who falls into tragedy in melodrama Missing You (2013). She took on her first leading role in teen drama Who Are You: School 2015

4. Yeo Jin Goo

Yeo Jin-goo (born August 13, 1997) is a South Korean actor. Yeo began his career as child actor, debuting in the film Sad Movie (2005). He went on to play the younger version of the lead roles in movies and television dramas such as A Frozen Flower (2008), Giant (2010), Moon Embracing the Sun (2012), and Missing You (2012). In 2013, Yeo played his first big-screen leading role as the title character in action thriller Hwayi: A Monster Boy, for which he won Best New Actor at the Blue Dragon Film Awards.

5. Lee Hyun Woo
Lee Hyun-woo (born March 23, 1993) is a South Korean actor and singer. He started as a child actor and appeared in television series The Return of Iljimae (2009) and Queen Seondeok (2009). He later featured in Master of Study (2010) and To the Beautiful You (2012)

6. Park Shin Hye: Old role- Stairyway to Heaven

Park Shin-Hye was born on Feburary 18th, 1990 in Gwangju, Jeollanam-do, South Korea. Her family consists of her parents and one older brother. When Park Shin-Hye was in 6th grade at Hak-Kang Elementary School in Gwangju, she was advised to audition for pop singer Lee Seung-Hwan's music company "Dream Factory" by her English teacher at a private institute. Consequently, Park Shin-Hye went to Seoul and auditioned for Dream Factory. Through her relationship with Dream Factory, Park Shin-Hye began training as an actress, singer, and playing the guitar & keyboard. Her family also relocated to Seoul in 2001.

7. Jung Dabin
Jung Da-bin (born April 25, 2000) is a South Korean actress. She made her acting debut in 2003 as a commercial model for Baskin-Robbins and was widely dubbed "Ice Cream Girl". She has since appeared in the television dramas She Was Pretty (2015) and The Flower in Prison

8. Park Ji Bin
Park Ji-bin (born March 14, 1995) is a South Korean actor. He began his career as a child actor, notably in Hello Brother (2005). Park has been serving in the military since May 26th 2015.

9. Kim Sae Ron
Kim Sae-ron (born July 31, 2000) is a South Korean actress. She began her career when she was nine years old and became a popular child star through the films A Brand New Life (2009) and The Man From Nowhere (2010). As Kim reached her teenage years, she was cast in more leading roles, notably in the film A Girl at My Door (2014).

10. Moon Geun Young
Moon Geun-young (Hangul: 문근영; Hanja: 文瑾瑩; born May 6, 1987) is a South Korean actress. Affectionately called the "Nation's Little Sister," Moon began modeling at the age of 10, then made her acting debut in 1999 as a child actress. She first rose to stardom through her role as the young Eun-suh in the hugely popular television drama series Autumn in My Heart (2000), followed by a well-received turn in Kim Jee-woon's critically acclaimed horror film A Tale of Two Sisters (2003). Moon solidified her star status by headlining the box-office hits My Little Bride (2004) and Innocent Steps (2005). At age 21, she became the youngest recipient of a Grand Prize ("Daesang") which she won at SBS Drama Awards for the television series Painter of the Wind (2008)

Other notable actors/actresses, including: 11. Yook Sung Jae
12. Nam Joo Hyuk
13. Nam Ji Hyun
14. Park Gun Tae
15. Seo Young Joo
16. Han Groo
17. Shin Se Kyung
18. Lee Min Ho
19. Shim Eun Kyung
20. Park Bogum

21. Nam da reum