How did the myth Nana Ogawa cross back?

In the TV series Myth, Yi Xiaochuan did not travel back, but lived from Qin Dynasty to modern times, because he could live forever. The specific story happened in episode 59.

Episode 59 Story Introduction:

Yi Xiaochuan and Gao Yao came to the thatched cottage yard to date Jia. Gao Yao was eager to get the old extremely to hand over the treasure chest, but was rejected. Lao Ji insisted that Yi Xiaochuan and Gao Yao should, according to the old rules of the year, let them finish the tea in the cup and then hand over the treasure box. After drinking tea table, Laoji finally took out the treasure box and opened it with Yi Xiaochuan's tiger pendant. Unexpectedly, they failed to return to modern times. Gao Yile was furious, but Yi Xiaochuan understood under the old point that the time tunnel did not exist, and if he wanted to go back, he could only live day by day.