Black hooded figures in literature usually represent death. A famous example is The Grim Reaper:
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Conect that with the fact that the black hooded figure in the MV bought a seastar in that convenience store. It looks like they were trying to symbolize that "Death" (the black hooded figure ) took yet another "star" (=celebrity= Jj0nghyuN).
What is alarming about this is that stores usually have multiple copies of one product. Which means there might be "multiple stars" in that shop that could be bought by "Death" anytime. So basically they're showing us that JJOnghuN and all the celebrities that suffer the same fate are sacrifices.
Also notice how the MV is called Atlantis. Bo@ also from SM) released and album and title song with the same name called Atlantis princess in 2003.
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You know the one with the iconic snorkle glasses:
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This is another proof of how 5M entertainment is connecting all their artists's concepts and storylines. They say they're trying to mimick Marvel universe. But I have another big theory about K-pop that's connected to this and that I will hopefully post soon, because I have a lot of schoolwork that I need to catch up on.