Last month, we reported that JYJ became the endorsement models for painkiller brand, 'Penzel Q'. The boys not only filmed a CF for the brand, but recorded a brand new song for them as well. Penzel Q just uploaded a video onto their YouTube channel which gives a behind-the-scenes glimpse into the CF. Meanwhile, the 'Penzel Q' song gets played over the clips. Check it out below: Tip: tee