I've read this novel long ago where the protagonist had many bloodlines but he didn't know about it because it hasn't been awakened. I remember that his appearance changes depending on his bloodlines?? I can only vaguely remember that there was an arc where he somehow got trapped into the Holy Land of Goblins(?) where there was this robot that only goblins(?) can command and he tried to fix some sort of Time Machine.
Easy. The Reader and Protagonist Definitely have to be in true love. https://www.novelupdates.com/series/the-reader-and-protagonist-definitely-have-to-be-in-true-love/
No wonder I couldn't find it in my stack of xianhuan/xianxia novels. I literally typed in all the keywords that I could remember to no avail. Turned out it was a yaoi novel but thank you so much~ I remember quite liking the ending though, heh.