Detective Baek Joong-sik is on the brink of losing all of his assets when he stumbles upon a bag containing one billion won while investigating a mysterious body mutilation case. Little does he know, he has stepped into the heart of a major incident.

After being released from prison, Kim Gukho's taste of freedom is short-lived. He soon learns that he is the main target of a public murder game with a 20 billion won bounty.

Attorney Lee Sangbong realises that he is stuck in the bottom 1% of lawyers in the country. As his ambitious business project starts to fail, Lee receives a life-changing proposal from a prominent politician.

Mayor Ahn Myeongja is investigated by the prosecution for corruption. She faces the biggest crisis of her political career. Abandoned by her party leader, she seeks to use Kim Gukho to create an opportunity for a comeback.

Seo Dongha, a violinist born with innate talent, scorns being Kim Gukho's son. Having won a competition and securing an opportunity to study in Vienna, Dongha has a secret plan.

Mr Smile comes to Korea to assassinate Kim Gukho but faces an unexpected situation.