Lee Jung recently had a high note battle with IU, showing off his own 5-step version of IU's famous 3-step booster. On the April 2nd episode of KBS2TV's "National Heroes", IU appeared as a special guest, surprising her uncle fans. The 'uncle MCs' including, Lee Jung, Kim Gura, and Kim Young Chul participated in a special 'IU's Scrapbook' corner, with announcer Jeon Hyun Moo acting as the host. Lee Jung was assigned to complete a special mission, which was to dance to IU's 'Good Day'. He danced to it perfectly, and showed off his perfect harmony with the young idol. The ex-marine also showcased his own version of IU's 3-step booster. He made it even more special by making it into an impressive 5-step booster, surprising the entire cast. Check out the 5-step booster below, the battle starts around the 9:00 mark: Source: TV Daily via Nate