Only 10 episodes are out, so we don't know yet. But pretty sure it's gonna be happy ending. It's modern drama , tencent and no time travel/parallel worlds/alien characters/gods = safe to watch drama.
If you want to know in what ep, then check spoiler
And he can see/sense her because of the necklace. It's called Heart Prying Mirror and thanks to that he can sense or see her and also listen to her voice when she's invisible.
He was the one who gave it to her first time too. Before her death. Why and how it happened it will be explained in ep 32.
In ep 36 Zhao Yao asks him when did he know that she's Zhao Yao. And Mo Qing answers that during her fight with North Mountain Lord. Because only she has such a look and imposing manner.
Male lead already is smitten, female lead needs more time.
He was the one who gave it to her first time too. Before her death. Why and how it happened it will be explained in ep 32.
In ep 36 Zhao Yao asks him when did he know that she's Zhao Yao. And Mo Qing answers that during her fight with North Mountain Lord. Because only she has such a look and imposing manner.
About why he sees her, there are some clues, so you might already know by now.
If you want to be spoiled, then read comment below.