Ye Lingtong's ship totally sank And soul land wikia spoilers said DD4 wont be a harem novel can find on lnmtl and wiki, but you know mtl and gtl are not good enough manganelo has 11 chapters but manhua's translation are slow and lost many novel details though the art is pretty god
htl no as for machine, lnmtl follow with web updates, SL wikia follow book updates (book publish once a month with over 60 chapters)
Yes she is his only true potential love interest, but that isn't saying much because the protagonist has inherited so much good genes from his parent that if he try to, he probably could had gotten laid at ten years old and he isn't shy about woman either and know how to flaunt his ultra good looks in others face even when is only 11 years old.