After releasing their first teaser video earlier this week, upcoming girl group 'A Pink' dropped their second teaser for their debut title track, "I Don't Know", which features B2ST's Kikwang! A Cube Entertainment revealed, "Lee Kikwang will be making an appearance in the drama teaser video for A Pink's title track as the leading male." With a sweet melody line and a romantic feel, the teaser strongly reflects elements of the spring season. Source: Star News via Nate