Heavenly has revealed an MV teaser for 'Happy Ending Romance' OST single "I Still," sung by one of the drama's main actors VIXX's Leo.

In the MV teaser, viewers can see Leo singing in the studio to create a special and meaningful OST for his very own drama series. "I Still" is a sentimental love song, with Leo assuring the object of his affection that he is still here and will remain loyally by their side.

Meanwhile, 'Happy Ending Romance' is a BL drama that follows a love triangle between three men in the publishing industry. Leo plays the role of best-selling author Kim Jung Hyun, who has a soft and caring heart despite his cold exterior.

The full "I Still" will be out on November 25 at 6 PM KST.