SBS Wendesday/Thursday drama "Heirs" (script Kim Eun Sook, director Kang Shin Hyo) released the filming scenes that show the staff fighting their fatigue and passionately filming through their "cat naps."

Despite the tight filming schedule, "Heirs" Lee Min Ho, Park Shin Hae, Kim Woo Bin, Kim Ji Won and Park Hyung Shik" was taking 5-minute power naps to rejuvenate themselves and supplant energy.

Lee Min Ho and Park Shin Hae have the most acting content to do and they are living inhumane schedules sleeping 2-3 hours a day. Lee Min Ho slept every chance he got on set and was registered as the "King of Sleeping" and Park Shin Hae wouldn't bloat despite all her naps and therefore is known as the "Expert of naps."

Kim Wo Bin is committed to each scene of the drama and films everything with as much energy that he has. In the 5 minute break that is given, he falls asleept and is taking mini power naps to carry on, as his fight is raising the heat of the set. In addition, in front of the camera, Kim Ji Won has a lot of charisma but after filming, he is quietly in the corner of the filming scene as he is recharging his energy while asleep.

Another episode is about Park Hyung Shik where he was relaxing and while he was relaxing and sleeping under his jacket, Park Shin Hae caught him. Park Shin Hae went silently over to Park Hyung Shik was who was asleep and quietly filmed him and released this picture as the filming set rose in laugher.

At Lee Min Ho's nap, netizens said, "Lee Min Ho's nap, Even I feel bad for him." "Lee Min Ho's nap - what if he's handsome while sleeping too?" "Lee Min Ho's nap, this is how "Heirs," my favorite show is made, and showed responses.