After the teaser video of the mysterious little boy Lee Jun garnered the attention of 'Superman is Back' fans everywhere, the show has revealed more information for this week's upcoming episode!

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It's been announced that Lee Jun is the son of actor Park Gun Hyung, and that his family will be making a special appearance on this week's episode, on June 4. The actor, who is close friends with Sam Hammington, will be meeting up with William's family on the episode, while also taking on the 'Superman is Back' challenge by taking care of Lee Jun by himself for the first time in his life as a father. 

Park Gun Hyung said, "Since I've been working on productions nonstop, I wasn't able to be there while my son grew up. Even for a little while, I wanted to know what it felt like to spend time with my son Lee Jun, just the two of us, through this program." 

Don't miss out on Park Gun Hyung and his adorable son Lee Jun on this week's 'Superman is Back'!