Cause and Effect

Talk to Chu Qiong to start the encounter.

After the dialogue, turn around and go to the glowing point ahead.

A cutscene triggers at the big tree, then talk to the NPC.

Keep following the NPC.

Finally, eavesdrop on their conversation.

After eavesdropping, step forward and join the conversation.

After the dialogue, follow them as they walk.

Quest complete.