For Yoo Jaemin, debuting as an idol is everything, but his skills are outshined in particular by Jung Woohyung. The other boy's laid-back attitude, especially toward their fans, irks Jaemin, but their dynamic shifts when they become roommates and Woohyung starts noticing cute sides to Jaemin that he hadn't before. The fans notice this change and Jaemin focuses all his attention on them and their love, which bothers Woohyung. Will their group, 4ever, hit it big, or will Woohyung and Jaemin's tumultuous relationship lead to its downfall?