YDPP (와이디피피) was a one-time four-member project boy group created by Starship Entertainment and Brand New Music. They consist of MXM's Lim Young Min and Kim Dong Hyun, and Starship's Jeong Sewoon and Lee Kwang Hyun, all of whom were previously contestants on Produce 101 Season 2. They officially debuted on April 5, 2018 with the "Love It Live It".
They are presumably disbanded following Lim Young Min and Kim Dong Hyun's debut with AB6IX and Lee Kwang Hyun's departure from Starship in 2019.
Their name is an initialism for "Youth, Dream, Passion, Purity".