初恋的味道偷偷的日见悠长
[chū liàn de wèi dào tōu tōu de rì jiàn yōu zhăng]
Translated as 'the taste of first love sneaks into every day becoming longer and longer,' it refers to the lingering memories and sentiments from one's first romance. The nostalgia for past feelings is suggested to grow stronger over time.