They were a pair of mandarin ducks in a previous life. They were born from the same roots, but due to an accident, they were separated for thousands of years, but they have never been separated. She kept reincarnating, and he kept looking for her back. Over the thousands of years, he transformed into thousands of characters just to be by her side, to be her only one, and to evoke a trace of her memories. Only then can we become mandarin ducks again and develop the strongest unity knot. With the power of unity knot, we can not only defend the world, but also protect our own love.