Mu Ning is a maintenance worker who fills and seals the ecological grass planting bags on the riverbank. She works with soil and grass seeds every day. During the devastating flood three years ago, her straw bag burst because it was overfilled. Her partner Lu Yan seriously injured her left leg in order to save her, and she never left the front line. Guilt made her choose to distance herself, bury herself in the boring work of stuffing bags, and punish herself with the iron rule of "seven points real and three points empty".
Three years later, Lu Yan returned as an ecological river embankment assessment expert. She hides, he chases. If the straw bag is too full, it will collapse; if it is not enough, it will collapse, just like her tense heart. During a flood season rescue operation, he suffered a recurrence of an old injury and was admitted to the hospital. She stood outside the door and did not dare to enter. Until he found the yellowed note in his personal diary - it turned out that he had never blamed her.
Leave three points in the straw bag for the grass seeds to germinate, and leave three points in the hearts of the people to get closer to each other. When the roots penetrate the bag and plunge into the slope, the fate between her and him also grows again among the mud and grass.
