A video of girl fighting a group of men is viral across social media with the claim that she was defending herself from harassment. Many social media users have shared the video praising the girl’s martial arts skill. Times Now tweeted a video with a caption “[WATCH] How a girl fought back to protect herself from harassment ” Archive | Twitter

(Source: Twitter/Screenshot)
Downloaded video from Times Now Twitter handle can be viewed below,
A Twitter user @TheFigen tweeted the video “Don’t mess with the girl! Hiyaaaaaaaaaaaaaa!” The video has 3.4M views and 47.9k likes at the time of writing this article. Archive | Twitter

(Source: Twitter/Screenshot)
For more claims click here.
FactO check:
A reverse image search of some key frames of the video directed is to a YouTube video by K-Tigers TV with a title “Taemi – Highschool Bullying [여고생 태미 액션]” dated 17 March 2015, with a description containing “*It’s been made while shooting an ad! its not real. It’s SCRIPTED”

(Source: YouTube/Screenshot)
A simple web search of “Taemi” directed us to a website which says she is a martial artist under K-Tigers E&C.

(Source:kpopping.com/Screenshot)
Conclusion:
It is a staged video made on how to defend from highschool bullying. The individuals in the video are trained professionals.