The rudest and stupidest guy, "No.2," happens to stay with an orphan named Jun Jeyoung who has the key to find a diamond. The Sencream Gang started to look for the diamond. Meanwhile, Jeyoung starts to have feelings for No.2. Watching her start to LOVE No.2, Lee Wooyeun (another guy) starts to gain feelings for Jeyoung. At the same time, No.2 starts questioning if his feelings for Jeyoung are love or just another feeling. Where in the world is the diamond?