Highlight's Dongwoon has revealed a moody series of teaser photos for his solo comeback mini album, 'Happy Birthday'. 

First, in one set, Dongwoon depicts the warm mood of a laid-back afternoon with vibrant colors. In another set, the idol depicts a slightly cooler mood in a room without much sunlight streaming in, creating a more quiet, private atmosphere. 

Meanwhile, Dongwoon plans on greeting his fans soon with the release of his 2nd solo mini album 'Happy Birthday', which will be out on his birthday, June 6. Check out his latest teaser photos, below!