In collaboration with famous Korean musicians Tiger JK, Bizzy, and Bibi, Pengsoo recently released a song titled “This Is Pengsoo.” It is in Pengsoo’s first digital single album, Billboard Project Vol. 1. The song is about Pengsoo’s bold aspiration to get on the Billboard charts. On Apr. 22, the song became No. 1 on the real-time music charts of Bugs and Genie. The profit earned from the song will be donated to an environmental organization to celebrate World Penguin Day, which was on Apr. 25.