It took him around 20 minutes to not only quickly create a double for himself and pass the 'seed' he was keeping in his soul courtesy of the vice-general lady to Seo-woo, but also to crack the formation around the base.
With his knowledge in formations, and strength he could easily find the weak spots of the formation for the moment and think of taking full control of it later.
Once that was done, he left the double behind to act like Seo-woo after giving him some instructions, and went towards Ye-jun.
In the current game she was an extremely important piece of the puzzle, so he had to make sure that nothing happened to her, or the baby in her belly. That was also part of their deal.
Still, due to her importance, she was bound to be under heavy surveillance as well, so he couldn't directly enter her room, and he teleported to the surroundings.
