i love how this drama started out with an amazing scene. it was already 13 years after the girls past. then they move 13 years back to when she was in high school. i love how this drama starts because it's about how she had to go through hardships and all that with family issues to. she moves in with her grandma. and attends school. before she even goes to school she gets in trouble and guess what all that comes to haunt her during school. you'll know what i mean when you watch the drama. but anyways, she tries hard to do good in school and makes 2 best friends who are her first friends in her entire life. then somebody gets jealous that the teacher and her (who have been through fun times together as student and teacher) like each other and that the teacher doesn't like her anymore and is giving all his attention to the new girl. turns out this is a rich girl. she ruins everything for everyone especially for our main lead actor and actress. then we go back to the present and then the past comes back again. now our student is a doctor. the teacher is also back as a doctor. and the rich is also back as a doctor. these 3 and some new people go through the hardships of being neurosurgeons and working with the people of their past. this drama shows us the surgery. like there is blood, needles, making incisions, opening up the skull. which is pretty cool cuz it just shows how much effort was put into this.