Why Have We Known Each Other Before?

At the beginning of reincarnation, I gave you my best, but the shackles of blood will last forever. I can't love you or retreat. I can only wish you happiness as a brother. But that man... I couldn't protect you after all. When we meet again in this life, regardless of cause and effect, I will never let him hurt you again. I am He Airan. I have long-lasting memories, like traveling in a bizarre dream. This is a sad trip, I am hurt and tired, but I know that I still can't stop loving you - "There are trees in the mountains, and the trees have branches, and my heart is happy, but you don't know it." After all the changes, when everything comes together again, it turns out that only I, Xiao He, know who she truly loves.