—Shen Daojun, what would you do if someone asked you to choose between the country that killed me and the country that betrayed you? —I will kill you. —You don't think about it. -Feel sorry. -No, you are right. We have always been in debt to each other and entangled with each other. Life is always like this. We meet each other in a short time, stay with each other for a long time, and then separate as quickly as possible. When we see each other again, whether you and I will hold hands and look at each other in tears; whether you are still alone and unaccompanied; whether your appearance has not changed and I am still as young as I am; whether I will hold you tightly; whether you will not struggle; whether you still remember me... Whether we will see each other again... The title of this article is taken from the elegiac couplet given to Lin Huiyin by Mr. Jin Yuelin: A poetic Qianxun Waterfall, an eternal April day in the world. You are my April day.