Traveling Between Two Worlds to Build the Strongest Empire

[Struggle for hegemony in another world + technology tree + infrastructure + management + black technology + two worlds + suppliers + not the Holy Mother + slow heat] Qin Tian unexpectedly gained the ability to 'double travel'. On one side is the fantasy world where he can practice, and on the other side is the Blue Star. "Supply mover?" "No, no, no, that's not very technical. If you want to do it, just be the best!" "Me!" "Civilized Porter!" Since then, Blue Star Technology has embarked on a new path. In another world, Qin Tian has become the overlord. The book is also known as "I'm in Fantasy and Crazy About Technology Trees" and "It Lets You Travel Between Two Worlds, but Doesn't Let You Integrate Civilizations"