Novel reader, pls spoil me who hired him to kill our ML

spoiler below
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It was ml's father.

Woah. Ngl I thought it's gonna be either the ML himself or his brothers(either the elder or younger one). That surprised me but why???

Someone cmiiw

ML's father was threatened of his own blood cuz he knew Ilhyun's had the power/connection. Anytime his son could kill him and took his position