檸檬少年深入我心
[níng méng shăo nián shēn rù wŏ xīn]
Translating as 'The lemon boy has delved into my heart', it creates a vivid imagery of a certain boy who left a memorable, probably pure, youthful impression, like the taste of fresh lemon, refreshing yet deeply touching. This could imply infatuation with someone young in a lively or refreshing way.