Korea has been taken over by aliens, and three agents from two different timelines spearhead the war against them.

An unknown monster strikes them! One day, a single scream in an urgent phone call was heard.

A top-level national secret organization, aka BUG (Bureau of Unidentified Genes), ​​is dispatched to catch the unknown beast that appears in the city center. Veteran Jung Bong, principleist Hyo Chan, and passionate newcomer Ki Woong, the three Korea's top special agents are starting to counterattack!

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Cultivator Jiang Zhao Yun's sword, Tange, leads her to Changshui Village, where a mysterious young woman, A-Ze, has suddenly appeared. A-Ze senses that something odd is going on in Changshui Village, and asks Zhao Yun to investigate the village together. They gradually discover the truth behind the strange happenings in Changshui Village. Aided by A-Ze, Zhao Yun — who had always believed that all demons were evildoers, and less worthy than humans — comes to realize that humans can be even crueler and more rapacious than demons. After the events of Changshui Village, the two agree to travel to Mount Qingyuan together.

A Communist spy serving as an officer of the Japanese puppet regime joins hands with Russian and Korean spies to execute an assassination plot.

In the year 1941, Nazi Germany declares war against the Soviet Union. Given that Manchukuo's loyalties lie with Cheng Tian, the Russians are caught in a situation where they face threats on all sides. Their intelligence agency devises a long-term plan in secret. Communist spy Tang Fei (Liu Yunlong) receives a mission to infiltrate the enemy by pretending to be one of their own. At the Security Bureau, he crosses paths with Cai Meng (Han Chae Young), a woman determined to fight against the Japanese regime. They gain each other's trust as they try to outsmart the enemy within their own territory.

Three brothers Bin, Hyun and Joon become drawn to the very pretty and sweet Yuri, a family friend. Yuri arrives from France to live with them for the summer while attending classes at their university, causing each brother to be attracted to her in a different way.

Amasawa Yoichiro was abandoned by his parents and has been wandering the world alone. Some trouble leads to his encounter with a shy university student Suzuki Nita who hopes to become an artist. A penniless and homeless Yoichiro makes Nita buy him curry on the grounds that he saved him, and mutters briefly about his family. Kiyokawa Kaoruko who runs Kiyokawa Realty has been keeping the ashes of Yoichiro’s late father because she used to be the caretaker of his apartment. There appears to be some significant reason why Yoichiro tries out curry every day.

A celebrated pastry chef and his fellow staff members at a bake shop embark on bittersweet adventures in love, work and friendship.

Immortals and demons have different paths, but there is a way in the world. What is Immortal? What is Demon? And what is the so-called righteous way? Old friends reunited in a gust of wind and snow.