In their hilarious new coming-of-age film TwentyKim Woo Bin and Junho play best friends trying to make their way in the world of dating, education, and careers. The two actors have become great friends in real life, but apparently that doesn't mean they would ever let each other date their sisters! Here's why.

When the two friends were guests on SBS Power FM Cultwo Show, the host asked Kim Woo Bin, "Would you be able to introduce your younger sister to Junho?"

After he laughed and thought for a minute, he replied, "No, I can't. We know each other too well, and I don't want to fight with him because of my sister."

The host then asked, "Are you saying that Junho has some flaws?"

Kim Woo Bin responded, "More so than flaws, I think he would imagine naughty things."

Junho retorted, "I have an older sister, and I think the same way as Kim Woo Bin. If they fight, I feel like I would get involved."

Looks like they know each other well! 

Have you seen there new movie Twenty? Would you like to see it here on DramaFever? Comment below! 

Watch Kim Woo Bin's movie The Technicians: