It seems like Jung Joon Young's return to '1 Night 2 Days' was a great surprise for the members. 

Recently, producers of '1 Night 2 Days' announced that Jung Joon Young is officially returning to the show. The first recording with all 6 members already took place on January 6. This exciting news must've been a secret because Kim Jong Min states that he and the other members had no clue that Jung Joon Young was returning. 

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In an interview on January 12, Kim Jong Min said, "I was really surprised. He came out of nowhere. I think you'll understand exactly when you see the broadcast. The members didn't know at all either. We thought Jung Joon Young was going somewhere else." 

The episode capturing Jung Joon Young's comeback is airing January 15. Make sure to tune in to catch the surprising moment of his return!