Group Teen Top's member Niel redefined Jo Sung Mo's song "I Swear".

In KBS 2TV "Immortal Song" aired on August 16, Niel sang Jo Sung Mo's song "I Swear" with a performance full of charisma, receiving much praise. He wore a red leather jacket and revealed perfect dancing skills on top of his singing skills.

Member L.Joe also made a surprise appearance in the middle of the song, adding to the excitement of the song. Jo Sung Mo said, "I think it's crazy how they changed the song into their own. They did such an amazing job."

Bada said, "You are young but the charisma you show on stage is amazing."