BTOB's Sungjae appeared on MBC's 'Radio Star' on May 27 and impressed with talk about his fairly well-off family background.  

On this episode, MC Kim Gu Ra gestured toward his guest and said, "Sungjae's household is quite good.  His father works at an IT enterprise."  Sungjae clarified, "My father is the CEO of an IT company that deals with semiconductors."  

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MC Yoon Jong Shin said, "If it's to that extent, isn't that a [wealthier] background than Siwon?" mentioning the well-known wealthy Super Junior member.

Kim Gu Ra cut in with, "Even if he's not at Siwon's level, that's a good household," then continued on, asking Sungjae what the IT company was.  He replied, "I'm not sure," looking taken aback to the audience's amusement.  

You can also see Sungjae mimic animals in a funny clip below!