It's Taeyang's year to plan his cousin's, Lee Seunghyun, birthday party. 2 weeks before Seungri's birthday, Taeyang gets a text from his mother asking if he's planning already. Panicking, Taeyang asks help from his best friends slash hyungs, Choi Seunghyun and Kwon Jiyong. In short, Seungri is about to have the best birthday party ever. Or not.