Sing Swim the Series has a grand opening as the first BL series of a big TV station, TTV starring Most and Achi, the winners from the reality show Y-IDOL under producing of Phee, former top BL actor. Though there is good feedback from actors' fans, there is backlash from novel fans as well, so Most and Achi must please fans to stop negative news. During the shooting, they both meet Fern, the one and only female character in the series. She has a tough and cheerful personality and declares that she will act as a shipper to record Most-Achi sweet moments. In this way, the friendship between them starts during the shooting.