I just read a theory about this mv A lot of us think that this mv shows of course flashbacks and current time, we can clearly see that by the clothes, alot of us think that Sunoo and the others where of course scared of the sun cause it would burn them, then sunoo discovers a way to stay unaffected by the sun, in the scenes in the old house, and teaches that to the others. Now in the current time they are clearly happy in the sun since they haven't felt that in so long, and don't want the summer to leave them. Also there's a theory where ni-ki has a way of going thru time, in the last scene in fact he comes back with the old ball he left in the past and came back with it to the others since they lost the ball into the sea. Hope wasn't too confusing Imfao I ain't good in explanations There's also a theory that I saw on tiktok that says that sunoo is the original vampire, meaning the one that turned them all, which I agree with. And he is using the others and their powers for example in this video there are shows heeseung's telekinesis, Jay's super strength, ni-ki's time travel, to prepare for a war with a werewolves that we see in the drunk-dazed music video
I think the Dark Moon The Blood Altar does relate to the japanese bighit group because in the drunk-dazed mv, two members appeared as werewolves and you know that the moon is normally associated with werewolves and the sun is related to vampires. So I think it was a clue