Misty and rainy, your mottled back is drifting away in the rain. My eyes were suddenly clear with tears, and I couldn't bear to shed them. Father, I don't know when your tall and straight back will gradually bend. I don't know when your black hair turned white; I don't know when your clean shoes and socks are covered with stains. Your umbrella back gradually disappeared in the rain. Heavy rain is like a note, eroding the fragile umbrella and eroding you. In an instant, thoughts kept coming. I want to protect you, just as you protect me. I will accompany you to the end of the world forever.