It’s a song by South Korean girl band BLΛƆKPIИK (블랙핑크).
“STAY” is the second track from their second single album titled “Square Two”, released on November 1, 2016 by YG Entertainment and distributed by KT Music.

On October 19, 2016, it was revealed that Black Pink would be the next YG artist to make a comeback.
Teaser images of all four members were released on October 27 for the second title track “Stay”. On October 30, YG released the behind-the-scenes video.

‘Square Two’ has a double A-side, “Playing With Fire” and “Stay” (written by Seo Wonjin & Teddy and composed by Teddy), and bonus track “Whistle (Acoustic Ver.)”.
They performed their comeback stage for both singles on November 6 on SBS Inkigayo and Mnet M!‘Countdown on November 10, 2016.

The music videos for “Playing with Fire” and “Stay” were directed by Han Sa Min, whom previously directed “Gotta Be You” by 2NE1 and “Sober” by BIGBANG. They were released on BLACKPINK’s official YouTube channel on October 31, 2016 (November 1, 2016 0AM KST).