Felix is ​​a 23 year old man who worked as a secret agent for 4 years, he is very skilled at physical fighting and shooting, that's why Lee Jong-suk is a top official in The agent liked Felix's work. Felix worked for a secret agency called Sejjang which was known to be very scary and dangerous And it is also closed from the outside world, there is no official information from the agent, making sejjang agents even more feared and hated

One day, Felix received an assignment from a high-ranking official, namely Park, to kill the son of the sworn enemy of the creator of Agent Sejjang The identity of the happy members themselves is unknown, only a few high-ranking officials know who the creator of Sejjang is, Actually, the child has been targeted for quite a long time, but due to lack of information because the child has always been kept a secret, it was only this year that they found out a little about She, All they know is the girl who goes to Yongseo High School in class 2, Yes, unfortunately, because of Felix's drama skills, Felix was sent there as a student to look for that child

Felix hates school, and he actually gets a troublesome assignment, when he gets to the gate he just keeps cursing his boss while looking down, and you watch that from afar