甜过初恋
Tiánguò chūliàn
This is usually used to describe something being incredibly sweet. It is so sweet that it is sweeter than one’s first love. To the Chinese, first love is something is that pure and just overall, really sweet and romantic. That is why this is also usually used in describing romance.
To break down the term:
甜过: Sweeter than
初恋: First love