help me find this manhwa please 
honestly im not really sure if it was a manhwa or a manhua since i read it such a long time ago but from whatever i remember about the artstyle it was probably a manhua.
Anyway its kinda like about this angel/heavenly deity thing, whose job is to help people sleep and stop their nightmares. So he had a client who was guy that could not sleep, and somehow this guy could see the mc too. So the ml's nightmares were about his ex who died due to some reason, and he could never really move on from that.
And yeah....honestly thats all i remember. Oh and the ml has black hair and the mc had blonde/white i think..
