He posted to Instagram, "If Ryeowook has Hyungsik then Donghae has Minhyuk. With Chan Young from 'Heirs'. After making a deal with Kim Eun Sook, I have a cameo on 'Heirs'. I'll tell you what sort of deal I made with Kim Eun Sook on 'War of Words'. Please watch 'Heirs' a lot! It's really funny. Let's hit 90% in viewer ratings when I'm on it."

Heechul also took a photo with CNBLUE's Minhyuk, who currently plays the role of 'Chan Young' on 'Heirs'. The producers of the show revealed that the Super Junior member will be making an appearance on 4 episodes, and that VIXX and 2EYES will also have cameos on the show.

Watch Heechul on the upcoming episode of 'Heirs' on October 17!