Mystery teaser site of 4 Minute!

Girl group, 4Minute has set up a teaser site (http://www.4min.co.kr) for the girl’s new album launched today. But guess what, it’s locked with password! Look like we have to figure out 3 codes to fill in the 3 blank spaces before we can access the website. In addition, the background of the site is an expensive sport car with ‘4 MINUTE, COMING SOON’ written over it. Can that be a hint? The girls will officially come back on the third week of May. Any idea what to put in the 3 mystery space?