Red string of fate|Magi:The Labyrinth of Mag...
Magi are magicians who are blessed by the Rukh. They are those who possess unimaginable powers that were said to be able to turn anyone a King.
In this world, there are only three known Magi's but one had arrived and so was known as the fourth.
They weren't expecting another one to arrive. She was created for him and only for him.
To protect their son, they sent her with memories that might or might be not true.
"May the Rukh guide you to his side." A voice said.