Juyeon and Haknyeon
Elaborating my answer more. So when i first know The Boyz, Juyeon and Sangyeon catch my attention the most. But then i got to know their personality, Jacob really shines to me. And then i hear them sing and New is a stand out (so pretty too). In these set of picture, Juyeon and Haknyeon look extra good.
In conclusion, it's complicated