After leaving Orleans City, Su Yu didn't immediately return to his territory, choosing instead to complete the main quest first.
After the territory had advanced to the [City] phase, the [Mage Tower] could now be built.
However, the construction of the Mage Tower was time-consuming, taking around five days to complete, just like the Wonders.
Moreover, a [Mana Pool] had to be formed after the completion of the Mage Tower, which would take another three days.
Only after the Mana Pool was finished could Su Yu convert monster materials into his own Experience Points.
So Su Yu was in no hurry, he would leave the Mage Tower to be built by the Territory's Magic Craftsman while he went off to complete the main storyline.
There were two main storylines; one was the princess line, and the other was Tina's line.
After some thought, Su Yu decided to start with the princess line.