C251 meet an old friend deep in the mountains

As early as in the Yin and Shang dynasties, it was a major musical instrument. Chen Ling had traveled back to the Ancient Era and heard a person playing it on the Hedong Battlefield, and that person was Cheng Su'er.

But after Chen Ling was transferred out of the battlefield due to achievements, and as he was escorted to the Dazhou City, he bid farewell to Cheng Su'er