Ayo! Keke so this will be the roles of the characters.... Pls. bear with me for I didn't write any starting yet xP so Amber will be a boy here!

Roles of the Characters:

Amber Liu/ Liu Yi Yun- The oldest among the four siblings

                                        -A handsome prince from Kosalas

Krystal Jung/ Jung Soojung- Was miraculously born to Earth by a fairy

                                           -A beautiful princess from Videhas

Others:

Victoria Song/ Song Qian- The mother of Amber

Sulli Choi/ Choi Jinri- Mother of Key

                                      -Was against the marriage of Amber and Krystal

Luna Park/Park Sunyoung- A princess who fell inlove with Amber while they were in the forest

                                               -Plotted a revenge against Amber and Krystal for being rejected

Taemin Lee - A brother of Amber

                       -Rejected Luna when Amber told her to go to him and consider him 

Onew/ Lee Jinki- Another brother of Amber

                              -Went with Amber  and Krystal when Amber was exiled

Key/ Kim Kibum- One of the brothers of Amber

                             -His mother wanted him to be the king of Videhas instead of Amber but refused

Jonghyun Kim- The father of Amber

Minho Choi- The father of Krystal