Heechul recently attended the press conference for upcoming tvN drama 'Flower Grandpas Investigation Unit,' looking handsome in a black suit with the thoughtful addition of a yellow ribbon that represents hope.

He was asked, "What parts did you work on in order to act alongside [veteran actors]?" Heechul replied, "Acting is a given, but I also thought to myself that I had to do my best for every personal thing, too."

SEE ALSO: Jun Hyun Moo bows his head and apologizes to Park Na Rae on 'I Live Alone'

He elaborated, "The very first thing I thought was that I should never be late.  I thought I should be there 10, 20, 30 minutes earlier, so I always went 30 minutes earlier, but the [veteran actors] were all there an hour earlier."

The drama airs on May 9 at 9:50 PM KST, so make sure to check it out.