Blue sky and blue sea, mermaid, love unfolds affectionately in one turn, one look back, when the stunningly beautiful mermaid Jinse desperately follows the wealthy young man Chen Weiming, but he leaves her decisively regardless of everything. Is there another secret, or is he in love with someone else? When she lost her memory and was reawakened by the love of the elegant and handsome plastic surgeon Ding Tianle, the real but ruthless events unfolded one after another. The emotional balance kept shaking in Jinse's heart. There was no other way but to answer from her heart. It turns out that love can also be polluted, just like the sea water becomes less blue. She came to this colorful world for him, but he never left this troubled world for her. Love, desire, and true feelings are all staged one by one. Who is the person she deserves to love for the rest of her life? Is it the person she fell in love with at first sight who cultivated human form regardless of everything for him; or the person who goes through fire and water for her, no matter what. Decision is the most difficult thing in the world, but no matter what the vicissitudes of life, no matter how the world changes, only love is worth all the courage. The stunningly beautiful mermaid princess Jinse, who risks everything for love, is the embodiment of love and beauty; he is the elegant, handsome and kind-hearted plastic surgeon Ding Tianle, all women love him, but he only loves Jinse; he is the melancholy and affectionate rich man William Chan, whose melancholy and handsome aristocratic temperament permeates him, making women unable to stop wanting him. Love, desire, and entanglement are staged here. Three generations of mermaids have composed wonderful love songs on earth. Mermaids can not only sing love songs under the sea, but they can also sing wonderfully in the human world.