They just happened to meet in the best years of their lives, and they had the most unforgettable love for each other.
They also have pain, and the origin of everything is love.
That's what Ziyan said to him: What I want is very simple. As long as the person I see every night before falling asleep is you, and the person I see every time after waking up from a dream is you. You can always eat with me, play with me, cry with me, laugh with me. Every moment of memory contains the most precious you, and even in the end we can hug each other tightly.