It could be, since women keeps on appearing, but so far, nothing sexual is happening, and MC is currently not interested in anything except for his goal, which to be fair I still don't really get what exactly it is lol.
They're gaining strength to prepare for the prophecy elder gu (the ghost with him) about something like the end of the world or what? And also while finding the things they need to extend elder gu's spirit form and things to make his physical body.
But elder gu is the ghost he got at the treasure place, yes? That's a bit recent, right? Why did he leave the place he originated from, the one with one of his sons? Is he looking for something? Looking for his other sons, maybe? I forgot it's been so long lol
I think his first goal was to take revenge to those who betrayed him but then along the way of looking for things to make him strong again he met that elder gu then told him about the prophecy about the darkness or the end something, now that became his priority to stop this havoc from happening.
Also along the way find a way to restore elder gu's physical body
I'm still in the beginning of chapters, I was so concerned that could be a harem, but thank god this manga don't have this tag (⌒▽⌒)