The new tower guard, Lin Mo, boarded the isolated Wuyu Island in order to find his missing archaeologist brother. He discovered that the "Eternal Night Lighthouse" on the island did not guide ships, but suppressed unknown entities in the deep sea. Under the guidance of the mysterious girl A Yao, Lin Mo must uncover the secret of a "lost song". This ancient ballad is both the hope of salvation and the beginning of all destruction.
