Sunmi spent time with former Sechskies member Ko Ji Yong's adorable son Seungjae on the upcoming '4-year anniversary' episode of 'Superman is Back'!

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During filming for the November 5th episode, Ko Ji Yong and his son Seungjae gathered together personal items to donate to a 'sharing market' event, where they met singer Sunmi. As you can see in the photos below, Seungjae and Sunmi had instant chemistry, shooting "Gashina" fingers at each other and kissing each other on the cheek.

Seungjae suddenly confessed to Sunmi, "Noona, you're pretty." 

This episode of KBS' 'Superman is Back' is airing on Sunday at 4:50PM KST.