According to some theory, Taehyun is the black cloaked person who attacked the others. There's a possibility that he time travelled together with Soobin, and that they were being controlled. That's why in cysm mv, only them had this liar sign. Then, in eternally mv, Beomgyu was fighting Taehyun, protecting book because he knew he was a liar...

Well, I'm no theorist, but this is really good. I really love how from the very beginning they were able to interweave their own universe. Everything is just getting so exciting 😄