Kim Hyung-min

Hyun, a loner high school student who lost his entire family in a terrible accident, is forced to leave his home and has to face a new reality where monsters are trying to wipe out all of humanity. Now he must fight against all odds to try and race against the clock to save what is left of the human race before it's too late.

Top student Ji Hye wants to go on a study abroad program for English. She gets her opportunity but can't make her passport because she's registered under her father whom she has lost contact with. She's always complained about her family but her complaints mount with this issue and she has to learn to listen to her family and sympathize that they're experiencing the same things in different ways.

Seung Hui is a pole vault athlete at Daehan College of Physical Education. She had amazing records in the past, but she's now suffering from a slump. She was having a hard time until someone came to Korea to help her. It's Kang Ji Na, a track-and-field star who was famous worldwide. Kang Ji Na becomes Seung Hui's coach, and they have their special 50-day training together.