I re-post this, as some people requested it, in order to not let the post in the discussion area to get buried.

Here is the Intro, called Shadow, sung by Zhou Shen with subs.
https://www.youtube.com/watch?v=IGR8YZZj2GU

This is the ending, called Hidden Heart, sung by BiBi Zhou with subs:
https://www.youtube.com/watch?v=g6741ak1ysQ

Syria (episode) sung by Duan Aojuan , with eng subs:
https://www.youtube.com/watch?v=pyWCHH4IFz8

Never Forget (Character OST) sung by Zheng Yunlong - no subs:
https://www.youtube.com/watch?v=ATUpft1KcME

Contemplation (Interlude) -quite bad quality, couldn't find it anywhere else:
https://www.youtube.com/watch?v=esIPUab0wBs&t=44s