Forever Yours (1998)

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Suh-hee is left by her mother at an orphanage as a small child. She grows up at the orphanage and becomes close to Sae-joon, the son of the orphanage's director. The Director objects to her son dating Suh-hee and kicks Suh-hee out of the orphanage shortly before she graduates from high school. Suh-hee must survive on her own in the outside world. Sae-joon continues to love Suh-hee despite his mother's objections.