A fantasy film in which the world is coming to an end due to North Korea's sudden announcement of a nuclear explosion, and an ordinary office worker meets five women while planning to live his last day without regret, and finds his life as he is caught up in an unexpected extreme situation.

The story of Princess Pyeonggang who was born as a princess but raised to be a soldier for Goguryeo. She dreams to be the first female Taewang of Gorguryeo but is confused about the new feelings experienced after meeting On Dal.

Set at a prestigious private high school in Gangnam, Seoul, South Korea. Eun-Byeol is a popular student at the private high school. She goes missing and returns, but she has lost her memory. She tries to find out the truth.