Happy Together' Singer Jung Seung-hwan has achieved a record of leaving the office. KBS 2TV Happy Together', which was broadcast on the 3rd, was featured as 'Legendary Cho Dong-A: Call My Song - 2nd Korean Wave Star Special Feature'. TWICE, Hwang Chi-yeul, Jung Seung-hwan and Dynamic Duo appeared as guests and played a full-scale work-off song. Prior to the full-scale confrontation, Dynamic Duo's medley, Jung Seung-hwan's hit songs, and TWICE's debut songs were turned into a series of hot moods. Since then, there has also been a confrontation of adorable songs. In particular, Jung Seung-hwan scored 81 points for the transfer 'Will you walk together' and TWICE got 76 points, which was somewhat poor with Winner's 'REALLY REALLY'. The song by Hwang Chi-yeul was the 'step' of Emerald Castle. The song score was 86 points. The last Dynamic Duo gaco said, "There is nothing to lose." He was enthusiastic about Naal's "wind memory" But he was laughing with repeated aberrations, but his score was 99 points and he surprised everyone. Above all, TWICE laughed once again with a look of dismalness on the score of 99 points. Meanwhile, Jung Seung-hwan's "You Fool" came out in the third room in six minutes while watching the full-scale karaoke showdown. Earlier, after So Chan-hui made a record of Ma with 15 minutes and Kim Tae-woo with 13 minutes, the record of the previous level Early Comet was renewed and became the main character of the Hatu Hall of Fame in 13 weeks. However, as TWICE's 'TT' was booked in the second room soon after, all TWICE members left the studio and attracted attention. TWICE, following Jung Seung-hwan, set a 12-minute record, which also broke the previous record. It surprised everyone.