Photos of Baek Ji Young and B2ST's Junhyung celebrating their first performance of "Good Boy" were released on�the 17th.

WS Entertainment shared on their official Twitter, "Baek Ji Young with Junhyung on their first 'M! Countdown' stage," along with a few photos.

Fans commented, "Your performance yesterday was the best," "Every stage should be like this," and "I'm looking forward to your sexy performances."

Baek Ji Young made a successful comeback after three years with her new mini-album, 'Good Boy', and finished her first comeback stage on the 17th. B2ST's Junhyung also made an appearance, which made for an exciting performance.

Source + Image: WS Entertainment's Twitter, Newsen via Nate