This is a love story about a sister-brother relationship between teachers that takes place in a green campus. The male protagonist is a sunny boy who has just graduated from college. He is tall, handsome, shy, youthful, and single-minded. For love, he will risk everything and even sacrifice his life. She is the only one in his world. She is mature and intellectual, elegant and generous, with a smile like a flower. She is like a dream, an angel, appearing in his life and giving him a colorful time. However, the dream may be a floating cloud in the sky, short-lived and gorgeous, but it will stay in his heart forever.