Seventeen unit BSS (comprised of members Seungkwan, DK, and Hoshi) is dropping a new OST single.

On March 10 KST, the unit will be releasing "The Reason of My Smile," the first single for tvN drama 'Queen of Tears.' The single is said to convey the emotions of the blossoming love between Baek Hyun Woo, played by Kim Soo Hyun, and Hong Hae In, played by Kim Ji Won.

Meanwhile, the 'Queen of Tears' OST is led by music director Nam Hye Seung, known for her sophisticated and stylish music in popular dramas like 'Goblin,' 'Crash Landing on You,' and 'Mr. Sunshine.'

Stay tuned for the single when it drops at 6 PM KST later today!