At the end of a remote headland, there is a century-old lighthouse. Tower keeper Zhou Yu discovered that after his grandfather passed away, the lighthouse would automatically light up with a strange green light every midnight. The light does not flash according to the navigation chart, but it always attracts ships to deviate from the channel and sail to the "Ghost Crying Beach" full of reefs. The old man in the fishing village said that it was a "sea guiding lantern" - designed to guide the souls of the dead on the seabed. Zhou Yu didn't believe in evil until he found a diary soaked in sea water in the basement of the lighthouse. The first page reads: "Don't let the green light come on a third time. It's counting.
