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Years after losing touch with his best friend, Le Jian meets a cryptic fan who leads him to a place that shouldn't exist—Guilai Abbey.
The story unfolds with an allegorical inspiration from the well-known fairy tale, The Little Mermaid, in which the mermaid princess falls in love with the prince it saves from drowning, with a surprising twist of the mermaid being a young boy…
On Green Island in the 1950s, the female thought prisoners chose to fight for freedom, but were more forcefully suppressed by the authority. They held on to their beliefs and hoping for true freedom to come.
As amateur painter Han seeks therapy from psychologist Shuzhen, their soon turbulent romantic affair unfolds. However, Shuzhen's dancer sister, Xuemeng, also develops a crush on Han, leading to unexpected incidents and twists.