Exiled to Lingnan from the Start, I Build Up the Land with My Sister

After transmigrating into the body of a wastrel exiled to Lingnan, he’s assigned to a deserted island from the start? Fortunately, his hiking backpack came with him as a pocket dimension, and his phone seems to be capable of upgrading... What’s there to worry about? He gathers seafood, digs for oysters, builds a salt farm, and takes on corrupt officials. That so-called abandoned salt farm is clearly a pearl of the sea!