Hoseok is a ray of sunshine.
No, really. He's a literal manifestation of a ray of sunshine that is born when sunlight hits a gemstone in a certain way, or something. Hoseok isn't really too clear on the details.
Min Yoongi is a storm. He's a huge whirling beast of swirling clouds and torrents of rain, and not a single ray of sunshine in sight. Unfortunately, he also has a huge crush on Hoseok.