After making a successful debut with "OK" in April,�B1A4 is ready to move on to their follow-up promotions for "Only Learned the Bad Things". Written by Wheesung, the song is about a man trying to win back the feelings of a lover who's already turned her back due to his past mistakes. The members said, "We're extremely grateful that Wheesung took the time to write for rookies like us. We feel that it's an honor to be able to promote with his song, and promise to show our best in consideration of the people who have worked so hard for us." B1A4 will be kicking off their follow-up promotions on June 18th through MBC's "Show! Music Core." Source + Photos: OSEN via Nate