The group that had snuck out of university was pure male, consisting of the few friends Little Brother Ye had at his dormitory. Ye Shuang actually knew them. During the holidays or when she went to the dormitory to pay her brother a visit, Ye Shuang was prone to seeing their naked bodies. After all, it was not uncommon for boys to walk around naked during summer, and sometimes her timing was so perfect that she arrived when they just came out of the shower.
Ye Shuang was familiar with the number of moles on their bodies, much less their faces. They even followed Ye Feng's lead and called her Sis and her parents Father and Mother but with an additional surname.
One of the reasons Little Brother Ye did not hesitate to call Ye Shuang for help was because everyone was familiar with this relationship already. His friends were practically half-brothers to Ye Shuang.