<human>: Can you summarize the given text in a few sentences?

Full story, rather long is [here].(
  
In short, this man, whom we'll call K. Lacks a conscience. To save his own skin because he was freeloading the entire time while he was in my project group, he mercilessly talk behind my back at every turn, gradually changing everyone's opinion of me.
  
This reached the breaking point when we submitted the project, in which he was watching movies during working hours. He instead claimed that i was the freeloading one. That i took all the credit for everyone's work. 
  
My course-mates, whom were getting bad opinions of me from K, turned on me and everyone started attacking (physically and mentally) me in support of K. Why? 
  
Though i was warned by K's previous victim when i got assigned to work with K, i could not do much to retaliate. I was warned that underneath what everyone saw of K - his looks and his charisma, was a set of sly tricks and a lack of conscience. To save his own skin, he'll stoop way below social limits.
  
Now a majority of my course who failed to see through his masks of false charisma and hypocrisy, are ready to raise forks at me when our vacation is over.
<bot>: my coursemates whom i used to be relatively close with, are turned on me when a charismatic hyprocrite, K attacks me to save himself from being caught freeloading during a major project. What can i do?***