Entrusted by someone to investigate the secrets behind SM Park, Sean becomes a powerful leader of 316 along the way. He begins to confront the head of the inspection team, eventually collecting the dirty secrets of the inspection team and bringing the inspection team to justice. Sean is a female character full of justice and courage. In order to uncover the truth of the missing girl case, she decides to go undercover in a park. In the process, she uses her excellent combat skills to defeat the bullies in the park one by one, not only eliminating criminals, but also winning the following and support of many female fans.