I don't think they will be pair again in this series because I just remember that in korean 2006 "famous princesses", the guy who went to the army is pair up with the older sister. Since LJH is in that role, so he will not have a love line with Hai Lu. Xian Jian will be the sister's first love, which will be later seduce by Hai Lu's character.
Well either way, i'm excited to see Hai Lu play a new character, one that does not so weak and cries all the time.