A modern soul falls into another world, reborn as a merman little princess. The soft and cute cub seems naive, possessing divine powers of shedding tears into pearls and purifying all things, accompanied by koi fish defying-odds luck. The sharp-tongued system's tasks are endless, maid A He loses her memory, maid A Lan schemingly lays out plans; funny A Yue is responsible for stress relief, hidden big shot Xiao Shitou follows to the death. Mountains and seas crises, fishing village crises come one after another. The milky merman little princess, with a young and weak body, gathers treasures, repels evil spirits, and protects everyone around her.