I could travel back and forth to the Tang Dynasty, where I picked up an amateur brother. After we became sworn friends, I discovered that this brother was actually Li Er! After helping him reach the ceiling of the Tang Dynasty, I brought him to modern times to experience technological life. I took this emperor to start an imperial team building and went to various dynasties. Ying Zheng, Zhu Yuanzhang, and Zhu Di were all drawn into the group of brothers by me, and we became sworn brothers across dynasties.
The plot is good and very interesting to watch.