JYJ's Jaejoong and ZE:A's Siwan were spotted getting casino lessons and more in behind-the-scenes clips from their upcoming MBC Mon-Tues drama 'Triangle'!

SEE ALSO: 'Triangle' release teaser of Lee Bum Soo, Jaejoong, and Siwan

Jaejoong shared after his first filming, "Today was my first filming. I think I rode the motorcycle a lot all day from the first scene to the last. I was hit by the wind a lot while riding the motorcycle. During the afternoon, it was very hot, but in the morning and early hours of the night, the wind got cold. Because my lips are frozen, the words couldn't come out of my mouth all that well. But the staff and director helped me adjust quickly."

'Triangle' is the work of PD Yoo Chul Yong and writer Choi Wan Kyu, who previously worked together for 'All In' and 'Swallow the Sun'. The drama portrays the story of three brothers Jang Dong Soo (Lee Bum Soo), Heo Young Dahl (Jaejoong), and Yoon Yang Ha (Siwan), who grew up separated in different backgrounds without knowing each other's true identities and meet twenty years later.

'Triangle' will premiere following 'Empress Qi' on May 5!