My name is Shan Lelang. Because of a strange fish bone of unknown origin that can bless safety, a legendary story was triggered - the mysterious death of his father, the mysterious undersea city mentioned, the mysterious departure of his brother, the mysterious poisoning of his friends, and even encounters with a group of mysterious people - the mysterious Li Jinchuan, the righteous and evil Renault, the stunning Song Qingping... What on earth is going on? Is it really related to my past life? Undersea City, what secret do you have?