Group Block B P.O. sings about their friends. 

P.O.'s single "Tony Lip" will be released on various music sites at 6 p.m. on Thursday.

The title of "Tony Lip," "Promise," is a tropical pop-style hip-hop genre song that exudes a summer vibe. P.O. watched the film "Green Book" and worked on the themes of "Partner" and "Friend" in person, and will deliver warm and firm feelings and longing for friends.

In particular, P.O., who was happy and comforted by the images of the two main characters in "The Green Book," expressed friendship in "Promise," and Winner's MINO, known as his best friend, participated in the feature making, adding to its completion Prior to the release of the song, P.O. had released a preview teaser video on Block B's official SNS. In the video, P.O. participated in the recording in a comfortable manner, swaying his body to the rhythm, or confidently raising questions about the new song.

P.O. has been actively meeting the public, appearing in tvN drama "Hotel Deluna" as well as in the release of "Tony Lip."