'Knowing Brothers' has released the preview for next week's episode.

For next week, the legendary male solo artist Rain and actor Lee Bum Soo have taken over the classroom of their celebrity brothers. In the preview, Rain and Kang Ho Dong -- long time friends since the old days of 'X-Man' -- get involved in a playful banter as Rain teases the comedian for "sticking to his old variety style." 

However, Rain then goes onto prove that he himself is actually "old" too, by showing off his awesome "old-school" hip-hop dancing skills!

Actor Lee Bum Soo also flaunts his acting talent, in genres of drama, action and more. Check out the full preview above! Stay tuned for next week's episode on February 16 on JTBC.