What is "Blood Chen"?
"Blood Chen" is actually nothing. It is the name of a special forces unit. Blood means: courage of blood. The interpretation of Chen is: Dragon of the five earthly branches. Xue Chen means: A dragon-like existence with courage born from blood.
Then why is there no record of such a special forces unit in the archives?
That's because its existence is top secret and not archived.
Then, since it is top secret, how do you know?
Do you want to hear a story? I can tell you a story. This story is very long~