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"Can I still be myself when the whole world is submerged in water?"
Seoul, 2057. The ice covering the world has melted, and the ocean has swallowed the city's buildings. Children who now live together on mountain slopes instead of in apartment buildings often dive into the deep sea in search of useful relics from the past.
Sunyul, a young diver from Nogo Mountain, discovers and awakens Suho, a humanoid machine who has been sleeping underwater with human memories intact. Once a child living with pediatric cancer in 2038, Su-ho has suddenly awakened 19 years later, having leapt forward in time. When Sunyul tells him that a war 15 years ago transformed Seoul into the submerged city it is today, Suho sets out to uncover the truth about what happened to him during the four years missing from his memory.
Sunyul needs Suho's help to win an important bet, while Suho needs Sunyul's help to recover his lost memories. Together, they dive beneath the water, gradually discovering more about each other along the way.
Meanwhile, the memories of Moonkyung Seo, the only adult in Nogo Mountain, who has been watching the two, begin to drift back into the past.
What truth awaits at the end of the four-year gap in Suho's memory?
What does it mean to find one's memories, to know oneself, or to have someone who remembers you? Which of these truly makes us who we are?
