On December 27, Davichi held their�'Adieu 2011 Shining a Light Concert' at Seoul Bangi-dong's Olympic Hall. During the concert Davichi sang their hit songs such as "Accident", "8282", "Love and War", and "Stopping Time". At one point however, Davichi surprised their fans with the display of their fierce side by singing and dancing to�2NE1's "I Am the Best". They also revealed their cute retro side by singing and dancing to�T-ARA's "Roly Poly" with a special guest appearance from T-ara themselves. Check out their covers below! Source + Image: TVReport