Speaking of this.
MA Heng was sent to the Black Dragon barbarian kingdom by Liu Chang to investigate the truth of the death of the king of Shu, Liu De. MA Heng did go to the Black Dragon barbarian kingdom.
Not only that.
MA Heng had also found out the truth of the matter.
He learned that after the Shu state Army defeated the Black Dragon barbarian kingdom, they were attacked by the Xia Dynasty's Army and were eventually defeated. The king of Shu, Liu De, died.
The culprit was, of course, Emperor Xia, Jiang Li.
Hence.
MA Heng rushed back to Shu country at full speed, ready to report the news to Liu Chang.
However ...
When MA Heng returned.
However, Fei Lian had returned to Jiang Li, the Emperor of Xia, and even Chang was killed. All of Chang's loyal followers had died in the battle.
not only that.
The officials of the Shu country had all submitted to the Xia Dynasty, and all of Liu De's direct descendants had been killed.