Sha Jin repeated the maintenance of lighthouses that had been repeated thousands of times. He carefully took care of the lights in each tower, filled up the lamp oil, and then looked at the passing ships in the distance.

He had taken a leave of absence when he came, and he was on a long trip this time of year.

He took out the equipment he had previously stored here from under a lighthouse, a backpack with storage space, and then filled it with some daily necessities and some precision measuring instruments.

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