This Kim Heechul fan art contains
fedora, felt hat, homburg, stetson, trilby, boater, leghorn, panama, panama hat, sailor, skimmer, straw hat, and business suit.
There might also be
campaign hat, beaver, castor, and snap brim hat.
Heechul needs to find out of the people on the show who are his highschool friends... Something like that, I'm not entirely sure what's the idea of this show.