The story of four young heroes hailing from the prominent families of Wulin, Feng Jun Long, Bao Shao Qing, Xu Ling Xiu and Sima Yan, who work together to investigate the famed murderer "Bian Fu (Bat)". In the midst of the investigation, they unveil the mystery left behind by the good and evil forces of Jianghu twenty years ago. From constantly suspecting one another to eventually attaining mutual trust and support, the four youths went through numerous tribulations and challenges, bravely pursuing the ideal jianghu and justice of their hearts. (Source: DramaWiki) ~~ Adapted from the novel "Bat" (蝙蝠) by Feng Nong.