It means having luster shinning which means his smile was shining
Answer:
Reading between the lines is also known as inferring. It is when the information isn't explicit but you have to do some digging for it and it is not out of reach, therefore a reading between the lines question is a question where it doesn't give you all of the info, but you have to work out some of it for yourself.
Can't help no novel wish i could though
