It seems like Cha Joon really is a yandere. I hate it when my intuition is right in that regard. So it's tsundere vs. yandere now. While Cha Joon is in the lead now with his seemingly kind and sweet attitude, I bet it will be Tae Oh who wins in the end. Because over time Cha Joon will be unable to hide his crazy side, while Tae Oh will reveal more and more of his cute side. Although the author might yet suprise us with a third guy, who knows.