I'm Invincible When I Travel to a Hunter

Traveling to the hunter world, Ye Fei became Killua's younger brother. "Ah, why?" Ye Fei thought angrily, "Why am I the younger brother..." After that, he always called himself Brother Killua, and he still said the same when he had other younger brothers. After acquiring a system, he embarked on the road of cheating, beating enemies and treating him as a genius; "Ye Fei is the most talented person I have ever seen" Killua; "Damn it, what's the use if I can't even beat my brother!" "You can blame me, it's not that the system is too strong" thought a certain person who took advantage and behaved. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.