A video of Kim In-seop exposing the incident goes viral, but no one raises suspicions. Park Jeong-hwan and Jeong Nam-yeon join Choi Kang, Park Byeong-nam, and Lee Yong-hee to uncover the truth behind the incident, and armed forces kidnap Kim In-seop.

Choi Kang, a new resident of Changri-dong, clashes with youth president Kwak Byeong-nam over recycling issues. He then pursues a suspicious foreigner to clear up a misunderstanding, only to be threatened. During the chase, an unexpected incident unfolds.

Choi Kang is suspected of being a spy after a clash with a foreigner of unknown nationality. While tracking the foreigner's secrets with Kwak Byung-nam and Lee Yong-hee, he discovers an unexpected clue. This clue connects to Choi Kang's past.

A series of mysterious incidents unfold in Changri-dong. Choi Kang, Kwak Byeong-nam, and Lee Yong-hee begin to investigate the truth behind the incidents. The military attempts to cover up the situation, and someone is quietly watching the whole situation unfold.

Choi Kang learns of the mastermind behind Kim In-seop's kidnapping and, with Kwak Byeong-nam's help, rescues Kim In-seop and takes him to safety. Kwak Byeong-nam, Jeong Nam-yeon, Lee Yong-hee, and Park Jeong-hwan gather there.

A crisis befalls the special forces tracking down clues to Kim In-seop's kidnapping. Their best efforts narrowly save their lives. The recovered evidence reveals a surprising truth, and someone appears before Hwang Mi-kyung and Do-yeon.

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