During his closed-door training, Kong Yu activated the Time Rule to its fullest extent, so while he was in seclusion for nearly a hundred years outside, in reality, it was nearing a million years. Achieving such results was only natural for Kong Yu, and now, with less than a year until the Gate of the Great Dao opens, further seclusion would not yield much progress. Thus, Kong Yu decided to exit seclusion. With his current strength, he was confident in making significant progress once inside the Gate of the Great Dao.
