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It is said that there will be a guardian angel beside every girl, who will always protect you when you don't know it, and will stay with you forever! "Hello, my name is Li An, and I am your guardian angel." His warm smile appeared in front of her, and she fell in love at first sight and will never forget it. "Li An, we promised not to leave, but why can't I find you again?" The girl cried with tears streaming down her face, which made people moved. "Yuyang, you have to smile! You have to remember that I am always here, guarding you in ways you know and don't know." These were the last words he left before leaving. One morning, she seemed to see the person she missed the most. She smiled and said, "Welcome home, my guardian angel!"