The elder sister is an agent of an organization that uses violence to fight violence, and the younger brother is a gentle man who only loves his sister. Once the secret is revealed, how will the relationship between the two siblings develop?
The man is a new member of the organization with unlimited potential. He should be cold-blooded but can never forget his feelings. The woman is his superior, and because of the organization's convention, she became his girlfriend, but it seems she can never be seen clearly.
Faced with complex emotional entanglements and the sudden invasion of powerful enemies, how can these kind-hearted people sort out various misunderstandings and fetters and finally find happiness?