Vanguard is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

From the live action series with the same name, Vanguard, has been renewed. It features a girl named Lei Xiaoyu that has caught the attention of a mysterious assassination organization! The tsundere Wu Yue of the Vanguard was assigned to be Xiaoyu’s protector. A love story full of youth, campus life, and action?! As the plot was revealed layer upon layer, the brutal truth gradually appeared...