Lee Chaerin and Park Chanyeol is a best friend since high school even their families is a enemy and rival in business. Both Lee Chaerin and Park Chanyeol is the most richest college student in Korea.  Chaerin and Chanyeol went to the same college that belong to Chanyeol, Cheonjae College. The most richest and expensive college in Seoul. Chanyeol known as a geniues student while Chaerin known for her ability in Judo and Taek Kwan Do. During night Chaerin spending her time as a car racer while Chanyeol doing something that no one knows except Chaerin. Their 8 years friendship ruined just in a blink when the feelings involved. Their friendship getting complicated day by day when Chanyeol and Chaerin falling in love with Sandara Park, a new student that been sponsored by Parkers Group that own by Chanyeol father. Chaerin and Chanyeol becoming her Knight whenever she get bullies in their college because of her poorness. And one day, Chanyeol found out something about Chaerin making his hatred toward her growing each day and they becoming  While Lee Chaerin, have found a reason to keep living. She found her most comfortable home when she look at Sandara. And no one knows every annoying things that she did there's a reason behind it all. Just with one purpose, because of Sandara. She give her life to Sandara even though Sandara keeps hurting her with every words that she don't wish to hear from her. And for Sandara, through all the things that Chaerin did to her, deep inside something growing up. A feeling that she can't even once trying to understand!