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Heart Signal Season 4 (2023)

~~ Adapted from the novel "Informa" (インフォーマ) by Okita Garyo (沖田臥竜).

Kang Dong-joon (Lee Byung Hun) is a young car designer who desires to start his own car company in Korea. He tries to get assistance from his father, but the family is troubled. His younger brother (Jung Woo Sung) hates their father, and leaves the country to become a car racer in the United States. Meanwhile, his sister (Lee Young Ae) also flees to the U.S. after conceiving a child with a U.S. army soldier.

Akira is the legendary killer known as The Fable. Following the order of his boss and due to being overworked, he lives peacefully with his partner Yoko as ordinary siblings. Akira still works part-time at design company Octopus with CEO Takoda and employee Misaki. CEO Takoda and Misaki are unaware of Akira's background as an assassin. Meanwhile, Utsubo is a representative for an NPO. But, Utsubo works with contract killer Suzuki to set people up for extortion purposes. They target someone at design company Octopus.