Goo Se Ra is a Manga/Manhwa/Manhua in english 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

The number one school in the country, Kangsan High School, Goo Se Ra, has a crush on Lee Seo Jun, who comes to Kangsan High School for teaching. She experiences all sorts of hardships with problem students. In order to protect her crush, Goo Se Ra decides to turn the worst problem school into a model school.