Kim Yong-Sun is a girl who dreams of crossing her own borders. Being a girl who grew up in a strict wealthy family she couldn’t have any other dream than just live her life to the fullest, living without regrets. All her dreams come true once she meet a girl around her age who goes by the name Moon Byul-Yi, a girl who grew up in a what seemed to Yong-Sun a normal family. Byul-Yi was raised with strict rules unlike Yong-Sun. Byul-Yi became very independent through the years which left a good impression on Yong-Sun. Will Byul-Yi be the person that Yong-Sun can live without regrets with? Or will Byul-Yi be Yong-Sun’s biggest regret?