(Korean: 약속해요 (I.P.U.

); RR: Yaksokhaeyo (I.P.U.))

is a song by South Korean boy band Wanna One.

The song serves as the pre-release single of their second extended play, 0+1=1 (I Promise You).

The special theme track is dedicated to fans, marking the 333rd day since the group's first public appearance.