Ji-soo is unsuccessful in fulfilling her dream of becoming a famous pianist. However, when she comes across a child with great potential, she decides to fulfil her dream through him.

Season 1 follows Baek Kitae, an ambitious KCIA agent who's living a double life. Driven by his thirst for power, Kitae works as an agent by day and a smuggler by night. Smart, suave, cunning and capable, Kitae rapidly moves up the ranks after using his smuggling operation to consolidate power, protect his brother, and generate vast sums of money for the agency. Seemingly unstoppable, only one thing stands in his way — a tenacious prosecutor who can't be reasoned with, bought or bribed. With everything at stake for both men, follow the duo as they look to take each other down.