Tang Zhen did not have the slightest regret in killing the red Horn King.
Even if the strength of the black prison tower City was above that of the Holy Dragon City, they would definitely take revenge on the Holy Dragon City because of this matter.
This black prison tower was like a hungry wolf hiding beside the Holy Dragon City. It always wanted to tear the Holy Dragon City to pieces and devour it. Moreover, they had already bared their fangs and used despicable means to plot against the Holy Dragon City.
Back then, if Tang Zhen had not travelled thousands of miles and destroyed two of the spirit fall battle zone's buildings, who knew what Holy Dragon City would be like now?
If Tang Zhen was able to endure under such circumstances, it would not be his character.