*spoiler* ... it's actually two things .. not sure if you'll consider them heartbreaking but I felt like crying over them .
The first is emperor huang will get seriously sick .. and in order to revive him gold loong's father ( chapter 108 panel 5 ) sacrificed his life by giving all his power to him then he faded away .. emperor huang crying made my heart bleed the second thing now is the gold loong himself  ╥﹏╥ it was supposed to be his marriage that day .. and while they were at it .. when inshu was putting the couple ring in gold long's finger .. gold loong started to fade .. inshu was panic-struck .. crying and calling out gold loong .. but gold loong disappeared in front of him  ( I just hope he went back to the heavenly realm) ╥﹏╥ can you imagine how shocked inshu was ? He passed out and entered the hospital.. he is really miserable.. not knowing where his lover is rn .. i felt sorrow for him bcz he was already lonely and suffering bcz of his father and when he finally found someone beside him he suddenly disappeared   ┗( T﹏T )┛that's it so far .. oh and actually there's an evil up in the realm who's causing trouble for everyone hopefully we won't have any more sacrifices (〜 ̄△ ̄)〜 ok my spam is over sorry it was long ( ̄∇ ̄")                                            
He's probably fine , I guess . I think he returned to the heavenly realm bcz his seal broke? maybe the author wanted to send him back so he could help in fighting the evil I mentioned bcz emperor huang alone couldn't subdue him ☹ I'm more worried about inshu tho since he is supposed to have a baby dragon to be summoned back to the realm now that gold loong has gone idk what is gonna happen to him ;( ..

		
I just finished reading some raws and surprisingly , it actually gets heartbreaking at some point