Xu Xunlan, an ecological regulator of carex paths in wetlands, has been walking in waist-deep mudflats all year round, measuring the density of carex inch by inch with a caliper. This job is boring and dangerous, but it is her whole belief. Seven years ago, her lover Lu Yanzhou went to Antarctica for the ideal of estuary dynamics. She took the initiative to let go because she was afraid of the foreign land. Seven years later, Lu Yanzhou returned as a scientific expedition expert, and the two met again in the same wetland. What he brought was the paper data on "leaving blank spaces and clearing paths to protect migration", while what she adhered to was the on-site truth of "densely planting and locking to prevent loss". When the two ecological standards collided fiercely on the mudflat, they were shocked to realize that their unfinished love was also faced with the same "density" choice. Should they sacrifice each other's ideals to complete a relationship, or should they separate again for their respective distances? In the crises of flood season rescue, trampling of migratory birds, and vine path collapse, they discovered that the survival rules of this wetland may be the answer to their love.
