Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.

Stéphane lives a quiet life as an eminent French Chef but when he decides to visit Soo, a mysterious Korean lady he fell in love with on Instagram, he'll embark on an adventurous journey full of discoveries.

A story that follows a family of four leading harmonious and contented lives. When a mysterious visitor starts residing in their basement, their lives are turned upside down as strange events begin to occur.