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Here is the step by step:

1. Make sure you already have Anna on her Slut Route and Max Hearts
2. Make sure you reject Nyxara and Master Zhen will tell you that he want to start gardening
3. Go home and tell Anna about Master Zhen to help him with gardening
4. Go to the Temple ( Torii Gate ) 3 times on the same day to progress the dialogues between Anna and Master Zhen
5. Go inside the Temple to see Master Zhen giving a gift to Anna
6. Tell Anna to show her appreciation to Master Zhen to initiate the Sharing Route ( Repeatable)