Replying...
Intro. Ryuhwan is a disciple of West. Like Tasha Godspell, Ryuhwan uses Mana pistols and a dimensional gallery. He also has his own Halloween. These similarities, as well as the fact that neither Ryuhwan nor Tasha turned out to be the name of their respective masters, led to supposing that they shared the same master. This could however be false because Ryuhwan studied under the direction of West, while Tasha studied under that of Edea Florence. Thus, unless Edea is the alter ego of West, or of his Sorella, or at least a student of West, it is difficult to explain why Ryuhwan and Tasha have weapons, equipment and support so similar.

Ryuhwan

@Elsa Winters