When Song Li was loneliest, Yuan Chuya appeared in front of her, and she fell in love with him from then on. She thought that there was only a distance between teachers and students, between adults and minors. Slowly, she discovered that the distance was far beyond that. She couldn't stay in his feelings or his life for long.
It turns out that the closest distance between him and her is the starting point. From then on, life can only go further and further away.