柠澈七予
[níng chè qī yŭ]
Breaking down this idiom, '柠'(ning4) means lemon;'澈'(che4) has the connotation of transparency; '七'(qi1) signifies lucky number 7 here; and '予'(yu3), short for give. The overall expression might be intended to create a light-hearted and whimsical mood suggesting purity and brightness, with touches of Western culture, such as the lucky seven. Or it may have special significance depending on the creator’s preference.