Super Junior's Heechul teased IOI's upcoming guest spot on JTBC's 'A Hyung I Know' with an adorable selfie of himself and Jeon So Mi.

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On December 3, Heechul posted the selfie below on Instagram with the message, "'A Hyung I Know' will feature IOI, who I'm very very very very very very very thankful to." In the photo, Heechul and Jeon So Mi look like siblings with matching dark hair and a piercing gaze.

Don't they look cute together?