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I see many people asking if they died in the end.
The answer is no.
It's like a frame to the story, the first time they started working/living together Dooshik was stuck in the water and Jooha saved him. That's how they got to know each other.
And now in the end it's Dooshik who saves Jooha from the water (though I think he still can't swim, but anyway Jooha can swim), and the memory of their first meeting helps Jooha to get back his memories.
So in the end they met "again" and Jooha got back his memories. The author also did an extra page where they get out of the water, but it is not included in the main chapters.