Stairway to Heaven (2003)

Song Ju and Jeong Seo, both having lost a parent, grew up together as if they were true siblings. Song Ju is always there to support Jeong Seo during her lonely moments, and she often turns to him for comfort in tough times. However, things take a turn when Jeong Seo's father marries Tae Mi Ra, leading Mi Ra and her daughter Yu Ri to bully Jeong Seo out of jealousy. Meanwhile, Tae Hwa, Yu Ri's tough and unruly older brother, finds himself falling for Jeong Seo, drawn to her innocence and kindness that starkly contrasts with his own nature.