2AM's Seulong released his new digital single "Melatonin" and its music video.

On Nov. 20, Seulong released his title songs "Melatonin" and "Witcher" along with their music videos through various music websites, catching much attention.

In the music video of "Witcher," Seulong is intensely attached to one girl and frantically chases after with a nervous look on his face.

The music video is different from the teaser that was released on Nov. 19, surprising many fans. The music video seems somewhat monotone and turns into color the moment Kang Seung Yeon looks at Seulong, bringing more life to the scene.

"Melatonin" and "Witcher" are the two title songs off Seulong's second digital single Melatonin.