Aspiring marine researcher An Fei is determined to protect the ocean and secretly admires a rising scientist, Mo Liang. Her plans are derailed by Ye Hai, a strange, bold young man who challenges her work and even claims she’s his wife. Though she tries to avoid him, their clashes uncover a hidden connection and stir memories of a past love that echoes the legend of Poseidon and Amphitrite, pulling them into a story bigger than either expected.