He met an INNOCENT GIRL that turns out to be a SPY.

A story about Gong Zi Yu, a wayward kid, and Yun Wei Shan, a spy who yearns for her independence. Gong Zi Yu lost his father and brother in an instant and was designated as the family's leader, but he quickly realizes that this authority has put him in danger. Yun Wei Shan has been sent to him as a sleeper agent, and she must now choose between freedom and love.