Just some suits-in-practice here, with touches of style for each person.
The shirt Kye-Sang has on has navy detailing along the collar that makes it seem more casual. The opposite effect is at work on Se7en’s shirt, with the polka-dots under the tie—it makes it seem more dressy. Especially since he *is* in a tie.
And Junsu’s tan plaid is subtle, dressy since it’s a completely matched suit, but the lighter color and texture make it spring-like and young.
This has been, the irregular Suits In Candid Camera