微笑是糖甜到忧伤回忆是蒙幻到迷茫
[wēi xiào shì táng tián dào yōu shāng huí yì shì mĕng huàn dào mí máng]
Smiles are Sweet Candies until They Become Bittersweet Memories, Which Are So Confusing. Implies joy and happiness once felt now have turned melancholy and confusing.