Erica is a doctor by professional and she comes from an ordinary family in US. She works in a famous hospital and co-operates well with all the workers and wants her work to always be perfect. She always wants to save people. There is a scientist who also works in the same hospital as Erica's and he is found of the director of the hospital. The director of the hospital is an old man who likes pets. One day, she overhears the director and the scientist Louis talk about their new invention which will destroy the world. Erica secretly steals the pill that was going to create a disease and spread fast hence destroying the world, she steals the pill to destroy it before its put in use. But accidentally it falls into her mouth and soon she is to turn into a zombie. The director knows about everything and sends people to get Erica but she wants to save herself so her friend Patrick tells her to travel to South Korea and find the famous doctor who will help her treat her disease before she turns into a zombie. As she is in South Korea, she accidentaly meets the BTS. They are good to her and become friens with her as they help to also look for the doctor who will treat her. She becomes close to all of them especially Teahyung who they slowly develop a love relationship and it is supported by all the members. Read and see if Erica can save herself and see the friendship and relationships between Erica and the BTS.