The Eldest Son of the Tang Dynasty!

In the ninth year of the Zhenguan reign, Li Yuan, the founding emperor of the Tang Dynasty, died in Chuigong Hall. Before his death, Li Yuan revealed a profound secret. Also in the ninth year of the Zhenguan reign, a modern-day hiker, Li Zhan, was visiting Tianshun Mountain in Lantian County when he was struck by lightning and transported to the Tang Dynasty. A magical fusion of forces, Li Zhan became Li Zhan, possessing the memories of two different eras. Watch as Li Zhan thrives during the Zhenguan reign. However, as the story unfolds, Li Zhan's true identity is suddenly revealed... I'm actually the eldest son of the Tang Emperor!