Seol Hee-ju, the eldest daughter-in-law of the chairman of the Pluto Group and wife of Ko Bong-sik, president of Pluto Motors, is found dead with a stab wound to the chest.

Unicorn, though a respectable corporation, is actually a shady organization that collaborates internationally in drug trafficking and assassinations. Its heir apparent, Ki-cheol, and his loyal ally, Cheol-ho, are among its leaders. Meanwhile, detective Min-gyu, the head of the detective unit, single-handedly works to uncover the organization's dark secrets, but is brutally murdered along with his wife by those who have even recruited the Interpol director.

Jiran, a self-proclaimed art student with both talent and pride, packs her paintbrush and heads to the beach to escape the shock of Professor Baek's harsh critique of her work and the misunderstandings arising from a chance encounter with her friend Eunsook's boyfriend, Junseok. While capturing the freedom of the sea on canvas, Jiran meets Hyunwoo, who is in love with Soyoung, who is dying of an incurable disease. Seeking to help, Jiran offers Hyunwoo a hefty fee to pose nude. Hyunwoo, mindful of Soyoung, accepts Jiran's offer.

International drug ring Madame Q and its action team members Kang-min and Cheol-ho travel to Hong Kong to deal methamphetamine with the Hong Kong Mister Y gang, but they sense a trap and shoot them indiscriminately.