Hidden IDs [Spies/Undercover Agents]

[S] - There is a hidden spy inside the Martial Soul Hall.

[M] - Tired of being an agent, Jun hides his identity and lives life as a Webtoon artist with his wife, Mi Na, and daughter, Ga Young.

[S] - A close member of the team secretly steals information about Build.

[M] - At one point in the series, Hiiro does your classic anime betrayal and works for the enemy secretly.

[M] - Ryusei is trying to hide his true intentions of joining the Kamen Rider Club.

[M} - King Cheol Jong hides the fact that he can fight and is planning a way to overthrow the royal court.

[M] - A couple with trust issues because they are both hiding secrets from each other.  The secret: they both work for the government. The FL is a field agent while the ML is... well, trying to be a field agent.

[M] - Mi Young is the mother of Oh Na Ri and the wife of Suk Hwan. However, her hidden relation to North Korea is revealed when her family goes on a vacation.

[M] - A man that just came out of nowhere is hiding his identity as a former agent.

[S] - Jin Guang Yao (Meng Yao) manages to gain the trust of the Wen clan leader. He becomes the informer for the other clans.