 Giddens liked his attitude, having seen Ko Chen-tung hiding in a corner, frantically studying the script just before his audition.The director chose Ao-chuan, Yen Sheng-yu, Hao Shao-wen, and Tsai Chang-hsien to play the roles of his high school friends.He described Hao Shao-wen as being a persuasive speaker, Tsai Chang-hsien as being a very good prankster, and Ao-chuan as self-confident.