SEE ALSO: Kwanghee parodies Sunmi's '24 Hours' on 'Nothing Wrong During Work'

The ZE:A member is known to be a jokester, which made him the perfect substitute father to entertain MMA fighter Choo Sung Hoon's daughter Sa Rang. It has been revealed that Kwanghee was also in Japan where Choo Sung Hoon has a house by coincidence and visited the family.

A 'Superman Is Back' rep told Star News, "Kwanghee's guest appearance is not because of the staff but Choo Sung Hoon's ties with him... Kwanghee visited Japan for their concert schedule, and Choo Sung Hoon invited him."

"We were able to see a new side of the Kwanghee we see on shows. Although Sa Rang looked like she was pushing away Kwanghee in the preview, please anticipate whether or not they can become close during the live broadcast."

Catch Kwanghee on 'Superman Is Back' on December 15 KST!