What is this place?

Can a boy with bitter past have a better future?

A highschool boy named Han Seo Yun is waking up one day but, it isn't the usual world. He rescues some people who joins him and tries to escape this strange world.
Will he be able to survive in the end ? How will he be able to escape this world ?
we would get the answers to these questions in the following chapters.
So, Let's see what he would do to save his new friends and escape this world.
Be tuned.