The energetic students met and got to know each other in the ivory tower. The ivory tower imprisoned them, whipped them, and urged them. Here, they share the same world, getting along day and night, laughing and playing, glaring at each other, helping each other, or remaining silent... Time flies, and there will always be a day of separation. Looking back suddenly, how many of the long rivers of time are truly engraved in your memory or even stay with you throughout your life?