What is a sunny smile? What's sunshine boy like?

Sunshine's smile is very handsome. You can't laugh with your mouth wide open. Try to show only the upper four teeth, and don't squint. This kind of smile can actually be faked. Sunshine boys are generally unscrupulous, healthy and lively, and are good at some sports, preferably humorous boys. Generally speaking, such boys wear casual clothes, and their personalities should not be too introverted or too serious or too frivolous. Such people are quite few.