The year she turned 9, she debuted in the KBS2 series Hometown of Legends, in the episode “Agaya, Cheongsan Gaja,” as the child actor playing Yeon-hwa. At the end of the year she was a nominee for the KBS Drama Awards youth acting award.
The breakthrough yearThe year she turned 13, she played the young Yoon Bo-kyung in MBC’s Moon Embracing the Sun. Herald Muse writes that she made her face known through this drama. That year she also appeared in child roles in Rooftop Prince in March and Missing You in November, and in December she received the MBC Drama Awards child actor award.
In 2013, she tried hosting Show! Music Core and played the young Jang Hye-sung in I Can Hear Your Voice. In 2014, she received the Drama Special award at the KBS Drama Awards. In 2015, she played a dual role in Who Are You: School 2015.
In 2016, she appeared in Bring It On, Ghost and, in the film The Last Princess, played the young Princess Deokhye. In 2017, she played Han Ga-eun in The Emperor: Owner of the Mask. In 2018, she played the radio writer Song Geu-rim in Radio Romance.
The year she turned 20, Netflix’s Love Alarm was released in more than 190 countries, and The Tale of Nokdu began in September. In October 2020, her casting as Pyeonggang in River Where the Moon Rises was confirmed. In 2021, River Where the Moon Rises aired and Love Alarm season 2 was released.
In 2022, she moved to Ieum Hashtag. In 2023, she played Mok Sol-hee in My Lovely Liar. In 2024, her casting in Good Boy was confirmed.
In 2025, she played Ji Han-na in Good Boy, and in August she signed with Peachy. In 2026, she was named on the presenter list for the Baeksang Arts Awards and was confirmed for White Scandal. Love Doctor premieres on Oct. 5.
Kim So-hyun (born Jun 4, 1999) debuted on Aug 7, 2008, the year she turned 9, in KBS2’s Hometown of Legends, and became known as the young Yoon Bo-kyung in MBC’s Moon Embracing the Sun on Jan 4, 2012, the year she turned 13. Netflix’s Love Alarm was released in 2019, the year she turned 20.
Ages are by calendar year (the year minus the birth year), birthdays aside.
Debuted as a child actor playing Yeon-hwa, a possessed child.
Source 01 · Star News (Korean) · Hometown of Legends episode · opens in a new tabSource 04 · Herald Muse (Korean) · From Moon Embracing the Sun to Bring It On, Ghost · opens in a new tabSource 05 · Top Star News (Korean) · Love Doctor comeback · opens in a new tabWas one of five nominees for “Agaya, Cheongsan Gaja”; Shim Eun-kyung won.
Source 02 · Asia Economy (Korean) · 2008 KBS Drama Awards · opens in a new tabPlayed the young Yoon Bo-kyung, the daughter of the Minister of Personnel. The drama’s ratings passed 20% within three episodes of its first broadcast.
Played both Hwa-yong and Se-na, the reincarnation of Hwa-yong.
Source 07 · Maeil Business Newspaper (Korean) · Rooftop Prince · opens in a new tabPlayed the young version of Lee Soo-yeon, played by Yoon Eun-hye. The first episode’s rating was 7.7%.
Source 08 · Newdaily (Korean) · Missing You premiere · opens in a new tabSource 06 · MyDaily (Korean) · Kim So-hyun interview · opens in a new tabReceived the award with Kim Yoo-jung and Yeo Jin-goo for Moon Embracing the Sun and Missing You.
Source 09 · MyDaily (Korean) · 2012 MBC Drama Awards · opens in a new tabPosted an apology for her mistakes after the live broadcast on April 20. She hosted with Noh Hong-chul and Minho of SHINee.
Source 10 · SBS Entertainment News (Korean) · Music Core MC · opens in a new tabSource 11 · Sports Chosun (Korean) · Kim So-hyun marine look · opens in a new tabPlayed the young version of Jang Hye-sung, played by Lee Bo-young.
Source 12 · Sports Kyunghyang (Korean) · Popular child actors · opens in a new tabSource 13 · Xports News (Korean) · I Can Hear Your Voice return · opens in a new tab Based on an article in which she announced her appearance in episodes 11 and 12 in early July. The exact broadcast date was not confirmed, so only the month is given.Received it for appearing in the Drama Special We All Cry Differently.
Source 14 · Star News (Korean) · 2014 KBS Drama Awards · opens in a new tabIn the first episode, played a dual role, switching between Lee Eun-bi and Go Eun-byeol.
Source 15 · Herald Muse (Korean) · Who Are You: School 2015 · opens in a new tabPlayed Kim Hyun-ji. The first episode’s 4.3% was the highest for a tvN Monday–Tuesday drama premiere to that date.
Source 16 · Sports Donga (Korean) · Bring It On, Ghost premiere · opens in a new tabPlayed the young version of Princess Deokhye, who is played by Son Ye-jin.
Source 17 · News1 (Korean) · The Last Princess · opens in a new tabPlayed Han Ga-eun, the first love of Crown Prince Lee Seon.
Source 18 · Sports Chosun (Korean) · The Emperor firewood date · opens in a new tabSource 19 · News1 (Korean) · The Emperor hits its highest rating · opens in a new tabPlayed the radio writer Song Geu-rim. The first episode’s rating was 5.5%.
Source 20 · Yonhap News Agency (Korean) · Radio Romance at 5.5% · opens in a new tabThe series, based on a webtoon by Chon Kye-young, was released simultaneously in more than 190 countries.
Source 21 · MBN (Korean) · Love Alarm · opens in a new tabPlayed Dong Dong-ju. The series started at 5.6% for episode 1 and 7.1% for episode 2.
Source 22 · Newsis (Korean) · The Tale of Nokdu premiere · opens in a new tabThe production announced her casting as Pyeonggang.
Source 23 · Maeil Business Newspaper (Korean) · River Where the Moon Rises cast confirmed · opens in a new tabPlayed Pyeonggang. The first episode’s rating was 9.4%.
Source 24 · Korea Economic Daily (Korean) · River Where the Moon Rises at 9.4% · opens in a new tabReleased at 5 p.m.
Source 25 · TenAsia (Korean) · Love Alarm season 2 · opens in a new tabLeft Culture Depot and moved to the agency together with Jun Ji-hyun, Seo Ji-hye and Yoon Ji-on.
Source 26 · The Fact (Korean) · Move to Ieum Hashtag · opens in a new tabPlayed Mok Sol-hee, who can tell when someone is lying. The first episode’s rating was 2.6%.
Source 27 · Yonhap News Agency (Korean) · My Lovely Liar gets under way · opens in a new tabStudio&NEW announced her casting alongside Park Bo-gum when it unveiled its 2024 lineup.
Source 28 · Edaily (Korean) · Studio&NEW 2024 lineup · opens in a new tabPlayed Ji Han-na, a shooting prodigy pushed into a public-relations police role. The first episode drew 4.8% nationwide.
Source 29 · Maeil Business Newspaper (Korean) · Good Boy premiere · opens in a new tabThe agency was founded by the actress Jun Ji-hyun.
Source 30 · Sports Kyunghyang (Korean) · Season of agency moves · opens in a new tabWas named on the presenter list with Song Kang, Hwang Min-hyun and others.
Source 31 · Joy News 24 (Korean) · Baeksang Arts Awards presenters · opens in a new tabPlays Ji Eun-seol, a former child actor. The Friday–Saturday drama reunites her with Song Kang after Love Alarm.
Source 32 · News1 (Korean) · White Scandal reunion · opens in a new tabPlays Im Yu-jin, a master’s student, with Choo Young-woo. The first broadcast is Oct. 5.
Source 33 · Ilgan Sports (Korean) · Love Doctor press conference · opens in a new tabEND OF SELECTED RECORDSSelected records, 2008–2026 · not a complete list of work. “Key moment” is an editorial label, not a measure of success.
What did they do, and at what age?
AgeTrail lines up the key moments of a life by age.
Debut and breakthrough are marked separately, and every record has a source.
Film & TV · South Korea
Jun 4, 1999 —
Ages are counted from the birth year 1999: the year of the event minus 1999, birthdays aside. “Key moment” labels and the connecting story are AgeTrail's editorial reading.
Fact-checked: 2026.10.03 · An independent archive, not affiliated with the person or their agency.