둘이 합쳐 IQ 50

Yeong-ho tries to keep his heart disease a secret from his wife but he becomes so depressed over his condition that he can no longer function at work and loses his job. To earn money, his wife takes a job with a family friend but Yeong-ho misinterprets his friend's act of kindness. He leaves home in a fury leaving his wife to discover the cause of his behavior and to begin a frantic search for him.

In a peaceful countryside village—known for its clear water and fresh air—lived a simple, honest, if somewhat foolish family of three. One day, two swindlers named Madam Oh and Yong-pal show up, casting a dark shadow over their lives. Through cunning schemes and deception, the family is manipulated and ends up losing their land and home overnight. From the shock, the father, Cheon-seok, collapses. Determined to catch the con artists, Hyung-rae (Young-gu) heads to Seoul—marking the beginning of his difficult life in the city.

For years, Zangga has been living on Earth masquerading as a simpleton. But when Princess Sara from the planet Star is threatened by the Rust Queen and her henchmen, Zangga teams up with warrior Su-ji and Bugeye Robokong to defeat the evil threatening universal peace.