Seo-jin is a widower still grieving his wife's death. Then he receives the news that his long-lost younger sister, Yoo-jin, who went missing 25 years ago, has turned up. Unlike the rest of his family, who welcome her into their arms, Seo-jin feels that Yoo-jin is a stranger.

Intruder

Life is tough for Chol-Min - his mother died during labor, forcing him to grow up alonge with his stoic police officer father. However, Chol-Min lives a high-spirited life and roams around town with his own mutt, a half-bred police dog, making friends and enemies along the way.