In the game, there is an orange secret manual related to an NPC named Hui Da. To obtain this secret manual, you need to find this NPC and complete its side quest. The following content will provide a guide on how to complete the Hui Da side quest in the game. After reading this guide, you should be able to complete the side quest and get the secret manual.

To start this side quest, you first need to go to the Shaolin Temple. After arriving at the Shaolin Temple, head to the side of the Fire Room, where you can meet a monk. This monk is Hui Da. After finding him, talk to him to trigger the plot. Complete the plot, then talk to him again.

During this conversation, you can receive a flute and some copper coins from him. After getting the flute, he will ask you to play a tune with it. To do this, you first need to find the sheet music, which can only be obtained by giving gifts to increase his favorability towards you.

After increasing your favorability and obtaining the sheet music, you can start playing. Upon completion, he will tell you that the sheet music is incomplete and needs to be perfected. You need to find the person who can do this in Pingkang City. Go to the city and look for a character named Scholar Zhang, who is the one capable of perfecting the sheet music.

After finding Scholar Zhang, talk to him and give him the sheet music. He will then perfect it. With the completed sheet music, return to the monk. Give him the perfected sheet music and play the tune once more. After completing this, you will receive the orange secret manual as a reward. This is how you complete the side quest.

The above is a complete guide on how to complete the Hui Da side quest in the game. After reading this guide, you should now understand how to proceed with this side quest. Follow the steps outlined above to complete the side quest.