소나기 (Downpour) is the fourth and final single of South Korean girl group I.O.I. The song was released digitally on Korean music sites on January 18, 2017. The lyrics were written by SEVENTEEN member Woozi, who also participated in composing the track along with Won Youngheon, Neighborhood Hyung, and Yamate.
On January 31, 2017, it was announced that the song won on SBS Inkigayo on January 29, being the final trophy for January 2017, with no live broadcast due to Lunar New Year's Day.
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