Who is the younger brother who controls blood in spells?

The character's younger brother is Polygonum cuspidatum Youren.

According to Youku, the role of controlling blood in Back to the Curse of War is stage expansion. The unfolding phase is the shape of the nine-phase diagram of the super curse, and the nine-phase diagram shows the eldest son. The operation of phase expansion is "red blood exercise", which can control your own blood. Because of the operation, the expansion phase can perceive the variation of people connected by blood.

In the cartoon 144, it is mentioned that due to the collateral effect of his red blood movement, he can immediately perceive the changes of his brother's body connected with his blood.