朴信惠
In January 2013, So released another rap EP titled "6 PM...Ground", and his recording process aired on "Music Triangle" as part of Mnet's "Collabo One" project. The four songs of the album were combined together to make a 12-minute music drama starring So, Park Shin-hye and Yoo Seung-ho; which was also re-edited into individual music videos for each track.