I Walk in Shadows, I Rule in Fire

The reincarnated Demon King, Ralph Dunn, hides his Rank 99 power, posing as a weakling to protect his sister, Thea Dunn. After years of silence, he finally unveils his true strength when she is harmed, crushing his enemies with overwhelming force and shocking the entire city. When his fiancée breaks off their engagement, he severs ties without hesitation. Upon regaining his memories, he recovers his full power and ascends to unimaginable heights.