Sang Doo! Let's Go to School

Cha Sang-doo (Rain) and Chae Eun-hwan (Gong Hyo-jin) were best friends growing up, who secretly have crushes on each other. One day, Eun-hwan's family goes bankrupt and debtors rush to collect their belongings. Eun-hwan tries to reason with a debt collector who is taking her father's old record player, but he takes it anyway. Sang-doo, on his way to walk to school with Eun-hwan, sees the whole thing. He tries to purchase it from the man, but is refused. In a struggle to retrieve the record player, Sang-doo ends up throwing a man off a bridge and putting him in a coma. Sang-doo is sent to prison for assault. After being released from prison, he finds that his parents have disowned him and moved to America and Eun-hwan has run off with her family.

Years pass, and Sang-doo now has a daughter, Cha Bo-ri (Song Min-joo), from a one night stand with Han Se-ra (Hong Soo-hyun). She is sick and diagnosed with leukemia. In order to pay off her hospital bills, Sang-doo becomes a gigolo. His uncle (Lee Young-ha) was a former gigolo and gives him advice on the trade.

One day, he comes across his long-lost first love, Eun-hwan, who is now a high school math teacher in his city. In an effort to regain her love, he returns to high school, first as a security guard and then as a student in her class. Unfortunately, she is engaged to his daughter's doctor, Kang Min-suk (Lee Dong-gun). Min-suk and Sang-doo start off as rivals, vying for Eun-hwan's heart, but later end up as good friends. As everything seems to be going smoothly for Sang-doo and Eun-hwan, circumstances prevent them from staying together.

;Cha Sang-doo – Rain

:Sang-doo is the protagonist of the drama. As a boy, he was charismatic and always popular. One day, he tried to retrieve his first love's cherished possession, but in the process kills a man. His life was turned upside down - he was sent to prison, his parents disowned him, and his first love disappeared. He ends up having a child with Han Se-ra. His daughter Bo-ri has leukemia and to pay her medical bills, he secretly becomes a gigolo with the help of his uncle.

;Chae Eun-hwan – Gong Hyo-jin

:Eun-hwan has been in love with her childhood best friend since high school, but was separated from him due to her family's financial troubles. As a sign of her devotion to him, she takes care of his dog until the day they reunite.

;Kang Min-suk – Lee Dong-gun

:Min-suk is Eun-hwan's fiancé and also happens to be Cha Bo-ri's attending physician. Initially, he dislikes Sang-doo and always finds ways to challenge him. Eventually, he gets to know Sang-doo's true character and becomes one of his best friends.

;Han Se-ra (aka Pal-ran) – Hong Soo-hyun

:Se-ra is a wannabe model. She was abandoned by her birth mother when she was young and has lived on her own ever since. She met Sang-doo at a restaurant and fell in love with him. After giving birth to Bo-ri, she gave her up for adoption because she was unable to pay for her medical bills. Sang-doo retrieves Bo-ri and raises her. Se-ra uses this to stay close to Sang-doo.

• Song Min-joo as Cha Bo-ri (Sang-doo's daughter)
• Lee Young-ha as Cha Man-do (Sang-doo's uncle)
• Yeo Seung-hyuk as Chae Ji-hwan (Eun-hwan's brother)
• Jeon Hye-bin as Yoon Hee-seo
• Shin Goo as Song Jong-doo (principal)
• Jung Ae-ri as Gong Shim-ran (Eun-hwan's mother)
• Kim Mi-kyung as Sang-doo's teacher
• Park Geon-il
• Song Ha-yoon{{efn|Credited as Kim Byul.}}

1. 세상끝까지
2. My Love - Jung Chul
3. Beautiful Thing
4. 난 멈추지 않는다
5. 내안의 다짐
6. Someday
7. 단념
8. 내 어린 시절 그 바닷가(연주곡)
9. Silver Lining
10. Perfectly Numb
11. 바람속으로
12. 세상끝까지

;2003 KBS Drama Awards

• Excellence Award, Actress – Gong Hyo-jin
• Best Supporting Actress – Hong Soo-hyun
• Best New Actor – Rain
• Best Actor in a Comic Role – Lee Young-ha
• Best Actress in a Comic Role – Jung Ae-ri
• Best Young Actress – Song Min-joo
• Netizen Award, Actor – Rain
• Netizen Award, Actress – Gong Hyo-jin
• Best Couple Award – Rain and Gong Hyo-jin

;2004 Baeksang Arts Awards

• Most Popular Actor (TV) – Rain

{{Notelist}}

{{reflist}}

• [https://web.archive.org/web/20040331194727/http://sangdoo.kbs.co.kr/ Sang-doo! Let's Go to School official KBS website] (archive) {{in lang|ko}}
• {{hancinema film|Sang_Doo_e__Let__s_go_to_school|Sang-doo! Let's Go to School}}
• {{IMDb title|0472440|Sang-doo! Let's Go to School}}

{{Lee Kyung-hee}}

Category:Korean-language television shows

Category:2003 South Korean television series debuts

Category:2003 South Korean television series endings

Category:Korean Broadcasting System television dramas

Category:South Korean romantic comedy television series

Category:Television shows written by Lee Kyung-hee