In 2006, she entered Seoul National University’s business administration department. In 2009, she began acting on the stage.
The year she turned 25, she debuted as Princess Boryang in the KBS1 historical drama Dream of the Emperor. In 2013, she completed a master’s course at Seoul National University.
The breakthrough yearThe year she turned 27, she appeared in SBS’s God’s Gift: 14 Days, and in December she played the kindergarten teacher in tvN’s Misaeng: Incomplete Life. Her Seoul National University business administration background drew attention.
In 2015, she played Jung Min-young in KBS2’s Who Are You: School 2015. In 2016, she appeared in KBS2’s A Beautiful Mind.
In 2018, she appeared in KBS2’s Suits and was a guest on tvN’s Problematic Men twice, in July and September. In 2019, she played Lee Soo-jin in tvN’s Memories of the Alhambra.
In 2021, she appeared on History Journal That Day and in June married a doctor who is a Seoul National University alumnus. In December she appeared in TV Chosun’s Uncle. In 2022, she acted in sign language in tvN’s Adamas.
The year she turned 36, she appeared in Netflix’s The Devil’s Plan and drew attention, and in December she appeared on Radio Star. In 2024, she appeared in tvN’s Maestra.
In 2025, she had a daughter. In 2026, she became a regular cast member of MBN’s Gyeongjesa Moim and appeared in the short-form drama Huhoekkaji 168 Sigan.
Lee Si-won (born 1987) debuted in 2012, the year she turned 25, in KBS1’s Dream of the Emperor, and became known in Dec 2014, the year she turned 27, when her role as a kindergarten teacher in tvN’s Misaeng: Incomplete Life and her Seoul National University background drew attention. In 2023, the year she turned 36, she drew attention again with The Devil’s Plan.
Ages are by calendar year (the year minus the birth year), birthdays aside.
Later completed a master’s course at the same university.
Source 01 · Star News (Korean) · Run, Jang-mi press conference · opens in a new tab Only the year of entry is in the article; the date was not confirmed.Began acting as a stage actor.
Source 03 · Newsis (Korean) · Husband revealed · opens in a new tab The articles give the year only.Appeared on television for the first time in the historical drama Dream of the Emperor.
Source 02 · Edaily (Korean) · Marriage news · opens in a new tabSource 03 · Newsis (Korean) · Husband revealed · opens in a new tabSource 15 · Top Star News (Korean) · Family photo for her daughter’s first birthday · opens in a new tabSource 18 · SPOTV News (Korean) · Maestra, the other woman role · opens in a new tab The drama first aired Sept. 8, 2012; the air date of her episode was not confirmed.A December 2014 article says she completed the master’s course in 2013.
Source 01 · Star News (Korean) · Run, Jang-mi press conference · opens in a new tab The articles differ on the field of study, so it is left out.Played Lee Soo-jung, a murder victim. The culprit was revealed in the episode of April 21.
Source 17 · Star News (Korean) · God’s Gift: 14 Days · opens in a new tabSource 02 · Edaily (Korean) · Marriage news · opens in a new tab The start of her appearance was not confirmed.Played the kindergarten teacher who takes an interest in Jang Geu-rae. Asia Economy wrote that she was drawing attention for being a Seoul National University business administration graduate.
Played Hwang Tae-hee, the younger sister of Hwang Tae-ja, and attended the press conference.
Source 01 · Star News (Korean) · Run, Jang-mi press conference · opens in a new tabIn the episode aired that day, her character locks Go Eun-byeol in a classroom to avenge her dead younger sibling.
Source 19 · Korea Economic Daily (Korean) · Who Are You: School 2015 · opens in a new tab Based on the air date of this episode; the date of her first appearance was not confirmed.Attended the wrap party for the KBS2 Monday-Tuesday drama A Beautiful Mind.
Source 20 · News1 (Korean) · A Beautiful Mind wrap party · opens in a new tabPlayed Chul-soon’s ex-girlfriend. Seoul Economic Daily writes that she made her face known to viewers with this work.
Source 06 · Busan Ilbo (Korean) · Seoul National University graduate Lee Si-won · opens in a new tabSource 07 · Seoul Economic Daily (Korean) · Problematic Men, Lee Si-won · opens in a new tab The air date was not confirmed.Was announced as a guest who would show the patent certificate for her own invention. TV Report introduced her as an actor who has been making her name in various works recently.
Source 04 · TV Report (Korean) · Problematic Men appearance announced · opens in a new tabAppeared as a guest for the second time that year.
Source 08 · Broadcast article (Korean) · Problematic Women episode · opens in a new tabPlayed Lee Soo-jin, Yoo Jin-woo’s ex-wife. The drama ended on Jan. 20 with its 16th episode.
Source 09 · Memories of the Alhambra finale remarks (Korean) · opens in a new tab The date is the finale date.Edaily reported that she was appearing on the program in May, when news of her marriage came out.
Source 02 · Edaily (Korean) · Marriage news · opens in a new tab The start date was not confirmed.Edaily reported on May 26 that she would marry at the end of June a doctor, a Seoul National University alumnus she met through an acquaintance.
Source 02 · Edaily (Korean) · Marriage news · opens in a new tabSource 03 · Newsis (Korean) · Husband revealed · opens in a new tab The wedding date was not confirmed in the articles.Appeared as Hwa-eum in Uncle, which aired in December.
Source 10 · OSEN (Korean) · Uncle · opens in a new tab Based on the December 2021 article.Played Secretary Yoon, a deaf assistant, in sign language. Her agency released her remarks ahead of the finale.
Source 21 · YTN (Korean) · Adamas finale remarks · opens in a new tabAppeared in the brain survival show and drew attention. Sports Donga writes that she drew great attention, and JTBC that she caught attention with her performance.
Source 11 · Sports Donga (Korean) · The Devil’s Plan pictorial interview · opens in a new tabSource 12 · JTBC (Korean) · Radio Star appearance announced · opens in a new tab The release date was not confirmed.JTBC reported that her chemistry with Ha Seok-jin, the winner of The Devil’s Plan, drew attention.
Source 12 · JTBC (Korean) · Radio Star appearance announced · opens in a new tabAfter the drama ended, she talked in an interview with SPOTV News about her relationship with The Devil’s Plan cast.
Source 13 · SPOTV News (Korean) · Maestra finale interview · opens in a new tab Based on the January 2024 article.Her agency announced on May 20 that she had a daughter the previous month, four years after her marriage.
Source 14 · Money Today (Korean) · Birth of a daughter · opens in a new tabSource 03 · Newsis (Korean) · Husband revealed · opens in a new tab The date of birth was not confirmed in the articles.With Kim Gu-ra, Bong Tae-gyu and Jeong Hyeong-seok, she introduces key moments in economic history. Top Star News reported that she is also a panelist on History Journal That Day.
Source 15 · Top Star News (Korean) · Family photo for her daughter’s first birthday · opens in a new tab The date she joined was not confirmed.The work was released on the short-form platform ReelShort. Im Joo-hwan played her husband, Ju-won.
Source 16 · Star News (Korean) · Huhoekkaji 168 Sigan · opens in a new tab A June 4 article says it had been released recently; the release date was not confirmed.Top Star News reported that she would appear in a new tvN survival program combining quizzes and psychological games.
Source 15 · Top Star News (Korean) · Family photo for her daughter’s first birthday · opens in a new tab The air date was not confirmed.Posted photos of her daughter’s first birthday party on her personal account.
Source 15 · Top Star News (Korean) · Family photo for her daughter’s first birthday · opens in a new tabEND OF SELECTED RECORDSSelected records, 2006–2026 · 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
1987 —
Ages are counted from the birth year 1987: the year of the event minus 1987, birthdays aside. “Key moment” labels and the connecting story are AgeTrail's editorial reading.
Fact-checked: 2026.09.30 · An independent archive, not affiliated with the person or their agency.