He and her met when the department was on a business trip together. She had a cold and quiet personality, while he was lively and active. Sitting in the back seat of the car, she listened to him singing songs all the way, as if she had gone back to the time when she was studying and going on an outing with her friends. She inadvertently remembered the person who had been hiding in her heart for a long time. It was so long that she even wondered whether that person still existed, but she was touched inadvertently and it hurt her heart.
Concept: Not every love can be expressed. The feelings that cannot be expressed will spread in the heart, just like the feelings when reading, sour and astringent but full of sweetness.