Red Velvet Irene's beauty made Han Don Geun incredibly shy on the September 8 airing of 'Cultwo Show'. 

On the recent airing, DJ Cultwo made fun of Han Dong Geun mature look, saying, "Is Han Dong Geun really younger than Irene? What is going on?" They continued teasing and asked Han Dong Geun to call Irene "noona."

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The singer blushed next to Irene and responded, "I kept getting surprised because Irene is so pretty. I can't look her in the eyes."

Did you know Han Dong Geun was younger than Irene?