Named after a tree by her dead mother. So-na struggles with coping with her past. When she was 12, she was kidanpped by Oh Gae-ri, who happens to be Hae-gi's older brother. Her mother died after the event. Due to this, she becomes depressed and tried to kill herself. She was taken out of school by her father to be treated for her depression and problems. She meets Hae-gi in high school later and falls in love with him. So-na owns the nursey called Snow Drop after the book her mother wrote, "Snow Drop"