Sisters are for sharing laughter and wiping tears.... having A sister is better than being a Princess friends come and go but sisters are forever sisters makes a bestriend in the whole world !! but sometimes sisters are probably the most competetive relationship within the family.. meet jiwon and jini the twins who grew up in the different places and path but the time helps them to meet again..but meeting up is the time for them to start the battle.. there's a fire and there's a snow power who is the enemy and who will be the hero? only one will survive and only one will rule the.... Blue. Castle!!