The song is the title track of their album 'Skool Luv Affair', which the members themselves had a hand in. "Boy in Luv" is produced by Pdogg, "Hitman" Bang, Rap Monster, Suga, and Supreme Boi.
The MV and song center around a boy (or boys) who have a crush. Check it out above!
[Update] - rest of the album tracks are now out, check them out through the playlist below!