Yang Tian had a dream, a long dream.

"Simin, you can promise Chen Jianfeng. Look, he's playing the piano under the dormitory again. He gives you a lot of things every day. He envies us so much." In the dormitory, a tall girl dressed as a student's sister took a bite of fruit and said to Chen Simin, who listened to the song in bed.

"yes, I would have promised him if I were you." Other girls in the dormitory chimed in.

this is a university in Guangzhou, where Chen Simin is a sophomore. The sisters around her are all in pairs and live together, but she is still single....