Head north and find [Winnie]. She will be standing next to the portal.
This NPC does not ask for any items.
Eventually, there will be information here about this quest. For now, please enjoy this Tang poetry:
燕草如碧絲，秦桑低綠枝。
當君懷歸日，是妾斷腸時。
春風不相識，何事入羅幃？