God Comes to Mountains and Seas

In 2032, one billion people around the world poured into the super virtual world "Mountains and Seas". Twelve-year-old Milo woke up from the black water of the Nine Colored Abyss, not remembering who he was. She only knew three things: the water would change color due to her emotions, there was a thirty centimeter long ink dragon wrapped around her wrist, and - the top floor of the Aiyin Tower piercing the sky in the distance hid a secret about her father. Lingji, the negative entropy produced by human irrationality, is the foundation of this world and the coveted prey of the ranchers of the universe. When she first held the sword, the water turned golden. When she first lost her companion, the water turned black. When she finally stood at the top of the tower - she discovered that this world was not a game. Her father was no hero. After the 10^100th digit of the universe's π value, there is a line of distress signals written on it. An epic tetralogy of Eastern hardcore science fiction mythology. It's not time travel, it's not rebirth, it's a hundred and one letters written by a father to his daughter in code.