Xu Ruohan

Covert security company Vanguard is the last hope of survival for an accountant after he is targeted by the world's deadliest mercenary organization.

Zhou Can moved to school in a small town from a big city, a place he didn't like, and kept thinking about going back to where he had lived. His grades are very excellent, so he doesn't have to worry about study in the new school. In terms of personality, he is always quiet, doesn't like to communicate with people, and his ability to make friends is lacking. Yu Jiao Yang is a wild and cheerful girl who has very poor grades in this small town. They are two people who are very different in every way but as the two meet and form a very close friendship, they stay together through every obstacle they go through.