You're referring to the popular Korean drama "Life is Beautiful" (2001). Here's some information about the drama:

(Saeng-hwal-i gwee-yo-mi) / Life is Beautiful Release Year: 2001 Genre: Melodrama, Romance Episodes: 16 Director: Lee Jae-kyoo Main Cast: Choi Soo-jong, Ha Ji-won, Kim Soo-hyun, Jung Ryeo-won

The drama tells the story of Kang Joon-sang (played by Choi Soo-jong), a young man who falls in love with a wealthy and kind-hearted woman named Yoon Ji-hyun (played by Ha Ji-won). Despite their different social backgrounds, they get married and start a new life together. However, their happiness is short-lived as they face various challenges and hardships.