"The Classic of Mountains and Seas: Great Wilderness Southern Classic" by Guo Pu of Jin Dynasty notes: "Ganmu is an immortal tree, and you will not grow old if you eat it."
So, since the immortal tree can give people longevity, can it guarantee and bless the eternal love between two people?
PS: It's not as complicated as copywriting at all. It is a human-animal novel with a very old-fashioned theme. Add elements of Western fantasy and magic.
Under revision...