|Written by||Yoon Sung-hee|
|Directed by||Lee Jang-soo|
|Country of origin||South Korea|
|No. of seasons||1|
|No. of episodes||24|
|Running time||Wednesdays and Thursdays at 21:55|
|Original channel||Seoul Broadcasting System|
|Original run||14 March 2001– 31 May 2001|
|official SBS website|
|Revised Romanization||Areumdaun Naldeul|
Beautiful Days (Hangul: 아름다운 날들; RR: Areumdaun Naldeul) is a 2001 South Korean television drama series starring Lee Byung-hun, Choi Ji-woo, Ryu Shi-won and Lee Jung-hyun. It aired on SBS from March 14 to May 31, 2001 on Wednesdays and Thursdays at 21:55 for 24 episodes.
Similar to its drama contemporaries, Beautiful Days involves conflicts in family relationships, as well as a love triangle.
Lee Min-chul (Lee Byung-hun) returns from studying in the US, to take an active role in his father's prospering music business, Victory Records. It turns out that his father (Lee Jung-gil) was involved in unethical practices in the past, as well as the murder of the father of Min-chul's stepbrother, Sun-jae (Ryu Shi-won).
Into the scene comes two girls from the orphanage, Yeon-soo (Choi Ji-woo) and Se-na (Lee Jung-hyun), who share a sisterly bond. Se-na gets inspired to become a pop star after a visit by the Victory Records boss on a charity event.
Years pass, and both girls arrive in Seoul to start their adult lives. However, they get separated. Yeon-soo finds a job working at Victory Records in hopes of one day meeting Se-na again and becomes involved in the lives of the stepbrothers, Min-chul and Sun-jae. Yeon-soo and Min-chul make a deal that they will help each other's siblings. Yeon-soo moves into Min-chul's family home as a tutor for his younger sister Min-ji (Shin Min-a), and Min-chul will help Se-na achieve her dream of becoming a singer. A complex drama unfolds,Min-chul and Sun-jae both fall for Yeon-soo. Yeon-soo chooses Min-chul, but their love is threatened by a terminal illness.
- Lee Byung-hun as Lee Min-chul
- Choi Ji-woo as Kim Yeon-soo
- Ryu Shi-won as Lee Sun-jae - Min-chul's stepbrother
- Lee Jung-hyun as Kim Se-na - Yeon-soo's sister
- Shin Min-a as Lee Min-ji - Min-chul's sister
- Lee Yoo-jin as Kang Na-rae - Yeon-soo's roommate and co-worker
- Lee Jung-gil as Lee Sung-chun - Min-chul's father
- Lee Kyung-jin as Jung Myung-ja - Sun-jae's mother
- Ha Jae-young as Lee Young-jun - Sun-jae's father
- Lee Sang-woo as Oh Jung-hun - composer and Sun-jae's high school upperclassman
- Kim Dong-hyun as Min Kyu-suk - bodyguard/chauffeur
- Lee Hwi-hyang as Yang Mi-mi / Kyung-hee - singer
- Lee Ae-jung as Shin Jae-eun
- Baek Sung-hyun
- Kim Chung
- Kil Yong-woo
- Yoon Gi-won
- Oh Seung-eun
- Kim Min-sang
- The streets and area around Sinchon-dong and Ewha Womans University.
- Synnara Record (formerly Tower Records) in Changcheon-dong, near Sinchon Station, was used as "Victory Records."
- Café Pascucci in Apgujeong-dong was used as the office of "Muse Records" and venue where characters meet and talk.
The original script had intended that the character of Yeon-soo would die, but in response to a flood of protest letters from anguished viewers, the drama lets her live. Sena went on to succeed as a singer.
- 그때까지 안녕 (제로(ZERO)
- 약속 (제로(ZERO)
- HEAVEN (이정현)
- 약속 (류시원)
- 그대뒤에서 (제로(ZERO)
- FOR YOU (제로(ZERO)
- 그때까지 안녕 (류시원)
- 언제나 오늘 처럼 (VARIOUS)
- 꿈 (이정현)
- MISSING YOU (류시원)
- 상처 (류시원)
- 너만을 위해
- 부탁 (ZERO(제로)
- HEAVEN MV (이정현) 
- "Beautiful Days". Korea Tourism Organization. Retrieved 2012-06-01.
- "Beautiful Days OST". YesAsia. Retrieved 2010-12-12.
- "Hallyu stars Lee and Choi greet Japanese fans". The Korea Times via Hancinema. 6 May 2005. Retrieved 2013-08-20.
- "Ryoo Shi-won invites 800 fans to press conference in Japan". KBS Global. 25 August 2005. Retrieved 2014-01-31.