Because he discovered that a portion of the Sword Origin within his body had flowed into the Hongqi Sword.
Previously, when Hongqi was still the sword spirit of the Hongqi Sword, Meng Fan had felt it was a loss whenever he shared even a tiny bit of Sword Origin with the Hongqi Sword.
Now that Hongqi had already been reborn as a human, having the Hongqi Sword still siphon away his own Sword Origin felt rather distressing.
Chapter 173