Midsummer Song in the Memo

There is an encrypted memo in Shen Yubai's mobile phone, titled "Nian Nian's Midsummer". There are 31 records lying inside, from "Candy for First Encounter" to "Children's Words about Marriage", each one is covered in frosting and shining. He thought this sweetness would last forever, until that summer, Su Nian took the iron box and the secret of the tree hole and disappeared into his world forever. Later he realized that the sweetest candy is often wrapped with the sharpest knife.