Don't "Fall" In Love

Do you know of the quote "We should LOVE, not FALL in LOVE, Because everything that falls, gets broken". Well, this story is about Angel, a girl, at the age of 15, nearly killed herself because she 'fell' in love with Kim Myungsoo. But that was 4 years ago. Now, 19 years old, Angel has almost moved on completely from the little incident and lives a happy life with her sister and her best friends. But what happens when Myungsoo returns to Seoul from america? What happens if they meet again, at another school? Will angel be able to face him as if nothing happened? and will Myungsoo feel sorry for what he did to her? and what did he exactly do to her?