Chapter 690 New Enemy: Sai

The young man suddenly opened his eyes with strong killing intent. After seeing the old man's face, the young man's killing intent disappeared.

"It has been ten years. Sai, you have trained secretly for so long. How do you feel?" The old man looked at the young man and said slowly.

The young man quickly stood up and bowed, and then said respectfully, "Sir, since I took the medicine you gave me ten years ago, my physique has been improved. In the past ten years...