I remember one arc where MC was a master of sect and she was looking for a person who is the reincarnation demon king to take him as her diciple her task was to save him from reborn villain MC went to her sect and meet ML I think he was also demon or something they both then become lover. MC has time and space power and both ML and MC went to underworld and spend great time there ML learn that MC is not a person of that world and he cage her in a cave and spend time with her but due to was happening between human and devil outside he leave her in cafe but some of ML enemy lure her out of cave and ML died in the end of arc. I am hoping to someone tell me the novel name!!!