Beomgyu Choi, a 16-year-old boy who lost his memory short range. Waking up without remembering anything a few days back. Sometimes symptoms include intense dizziness that obliges him to take a tonic for the headache. Beomgyu has no parents, no brother, no one but his four friends. Soobin, Yeonjun, Taehyun and Hueningkai They're the ones who are always there when Beomgyu's in trouble. Always, all the time. A lot of things went wrong when he started losing his memory. Dreams are uncertain, they're abstract. And weird. It haunts him every time he's in the underworld. Conscious, sunk in dense darkness. Until a shocking fact he discovered. The fact that his four friends are not real.