Tide, Rising and Falling Sand

Marine biologist Lan Jin discovered that the "Blue Tears" research left behind by his father was actually related to biological variation in the East China Sea. In order to prevent this ecological disaster, she and Coast Guard Captain Lei Yi conducted an in-depth investigation and uncovered the truth behind the military's secret experiment. When Lei Yi chose to sacrifice himself to save the coastal residents, Lan Jin took the risk and sneaked into the underwater crater to release the antidote. Three months later, Lei Yi miraculously returned with the mark of the ocean, and the two reunited at the seaside to protect the blue together. A journey of redemption in the deep sea where science and humanity intertwine.