An "Alt Account" refers to a secret social media account that you can't easily show others. "Kang Suhyun" is someone popular enough to be class president and also excel in school, but as they say, the brighter the light, the darker the shadow. He secretly runs an explicit art account on social media that absolutely no one can ever find out about, but... "To think that sunbae is the famous explicit artist...Hehe... Looks like I've found your weak spot now..." Unfortunately, his hidden identity is discovered by "Lim Ji-ah", a socially awkward outcast at school. From that moment on, Suhyun's once ordinary life began to spiral out of control.