(Photo : EXO Official Twitter Account) EXO's Kai has landed on four Billboard charts for the week ending on Dec. 12! EXO's Kai made his solo debut on Nov. 30 with his first mini-album and he has been attaining impressive achievements since then. As soon as "KAI (开)" was released, it skyrocketed to the top of iTunes Tops Albums charts in 50 countries across the globe, including Denmark, India, Costa Rica, Oman, Mauritius, Azerbaijan, Macau, South Africa, France, and Hong Kong. Most recently, EXO's Kai has also made it into four Billboard charts for the week ending on Dec. 12. The idol's solo debut mini-album "KAI (开)" peaked at No. 7 on Heatseekers Albums and at No. 11 on World Albums. The mini-album's title track "Mmmh" came in at No. 15 on the World Digital Song Sales chart. The artist himself also secured a spot on the Emerging Artists chart, landing on No. 48.