15& member Park Ji Min and Akdong Musician's Lee Soo Hyun caught much attention with their increased beauty.

On SBS's singing competition show "K-Pop Star 4," which aired on Sunday, the winners of previous seasons - Akdong Musician, Park Ji Min, and Bernard Park - made appearances. They put on a special stage with the songs they performed during their competition.

Park Ji Min and Lee Soo Hyun especially garnered much attention with their increased beauty. Having debuted at a young age, they had only been cute girls, but they seemed to have both matured in looks.