Transcending Battle Through the Heavens: I, the Xiao Clan's Counterattack System

What the heck? I've actually transmigrated as Xiao Yan's older brother, and my name is Xiao Feng-just the name sounds extraordinary! Su Yuan, an ordinary young office worker from Earth, unexpectedly transmigrates into the world of Battle Through the Heavens, becoming the third son of the Xiao family (Xiao Zhan's third child, twin brother of Xiao Yan, but due to soul transmigration, their appearances are completely different). At this time, the Xiao clan has declined because their ancestor Xiao Xuan failed in his attempt to become a Dou Emperor. Dou Qi is thin, powerful enemies surround them, and the Hun clan is eyeing them covetously. In the future, the Xiao family will face annihilation. Xiao Feng awakens the strongest system, embarking on a journey to hide his strength while defying fate. At the same time, he encounters another transmigrator from Earth, Hun Dan (the son of Hun Tiandi, who transmigrated with a low-tier system and aims to help the Hun clan rule the Dou Qi continent). The two transmigrators engage in a millennium-spanning battle for supremacy across realms. I also have a system-what Hun clan, Hun Hall? I'll crush you all...