It seems to me the idea of MV is to show that for the sake of love, a choice is made between a familiar and long life without a soul and a new world with a short and difficult life full of love. This is an analogy with the Little Mermaid on the contrary, so there is a lot of water, symbolising the connection with another world, the world of water with a long life without love, which the guys are ready to leave. The last frame is very symbolic.