After receiving the letter from the Sun Kingdom, Chiyou left as fast as possible because the details inside the letter were really shocking.
So Chiyou has to leave the Sun Kingdom and after handing over all the stuff to his wife, Chiyou didn't wait anymore and left for the Sun Kingdom.
The Sun Kingdom-
Chiyou reached the capital of Sun Kingdom in two days journey, it would have taken him a much more long time but he took shortcuts, same as the one he took during the disappearance of Sun Mo and he was also on his horse so it was way faster than everyday ride.
As soon as Chiyou reaches the capital, he went straight towards the Imperial Palace.
Inside the Imperial Palace-
The moment Chiyou stepped inside the imperial palace, he could feel that there is some change in the air of the Imperial Palace.