On the gate tower, a girl is looking out through the parapet, alone, as if being able to penetrate beyond the horizon. She has been guarding here for three years like an ancient sculpture, looking for something no one knows, doing nothing more than waiting. But right now, she glances in panic and hides away, whilst a tall, handsome man boards the tower. He looks around and sighs, gently, takes out a red vertical bamboo flute from his waistband, plays, alone.
　　 Time rolls back to three years ago
　　 My name is Tianxuan, the first born son of the richest in town, but I do disgust those ignoramuses, rapacious businessmen around me. My real ideal is literature, writing poems all day round. That day, while I strolled and looking up to the view of joint line connecting the s ky and the earth in front of me, a beautiful phrase came over to knock my mind:
　　 Fortress of Chu connects three rivers, Gate of Jing dredges nine channels.
　　 Water is falling away out of the universe, view of mountain is fading into the nihility.
　　 Gradually, the faint aroma of lavender came from behind, and then a pair of tender hands covered my eyes: “guess who, brother Tianxuan”. I smiled and pulled her hands down: “No kidding.”Yu-er pouted and said, “How could you figure out me every time?” I smiled and scraped her little nose, “You said yourself when you were seven that lavender is always in your pocket. How could I forget this smell.”Yu-er’s face suddenly turned red. I looked at Yu-er and said: “You has already reached the age of considering marriage, then, will you allow me take care of you for your whole life?” Yu-er’s flushing face sneakily glanced, and I nodded seriously.
　　 Yu-er already knew that I was aiming at study and would leave for a long travel sooner or later, so she traded her heirloom jade for a red vertical bamboo flute and carved nine dragons for the wish of her love could rise in the world. She held the flute and said to me: “Brother Tianxuan, no matter how long or how far you are going to leave, only if you play this flute on the gate tower, I will come back to see you. This is the proof that our love never change.” Then the flute was handed to me, and I nodded sincerely when I was holding it. We carved our engagement on the rock:
　　 Live and die together, stay together forever.
　　 Hold your hands, grow old together.
　　 And while I boarded on the carriage taking me to distance, I did not know Yu-er had been found by my parents. They poured a lot of nasty words on her like she was only eager for my family\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s money, so Yu-er left. But she did not leave the place of our engagement and waited for me, for three year, waiting.
　　 Numerous times, I wanted to go back desperately when I got the message, but I never managed to break the obstruction of Martial arts masters my parent hired protecting me, until an autumn night three years later I rode to Yu-er by night, regardless how many hardships lying in front of me, they cannot fluctuate my mind of finding Yu-er. “How many things in your life worth your desperating?” If none, maybe it is your tragedy; if you have, desperate now! When I rode back to our engaged, nothing was left but withered leaves blowing in the wind. Why?! Why does not she come to see me?
　　 I played the flute she gave me while tears contatnly shedding down, the sound of flute went deep went far, like pouring out my missing love in the last three years, faint old events like dreams, the passed time gradually emerged, whose eyes are hazy now? The sound of flute like snow is freezing whose heart? The wind rises, opening black clouds. Well, I just look blankly on the gate tower, you can come to see me or not to, I will be the same waiting here for you, and leave quietly. While Yu-er inside the town has already cried her shirt wet. After that day, I come to play the red flute every day, while Yu-er listens and cries inside the town for decades. She knows he is outside, the unforgettable sound of red flute for years in her heart; he also knows she is inside, the lavender aroma had carved in his soul long ago.
　　 Flowers bloom similarly each year, but the persons cannot go back to last year.
　　 Can we ever still stay in yesterday?