I will make it easy for you, NGK means Not the Good Kind.
The film is about Nandha Gopala Kumaran, a well-educated youth who returns to his native to do organic farming, being forced to get into the “dirty” pool of politics. How he swims and even thrives here is supposed to the story. Unfortunately, the film falls apart due to a bumbled screenplay with many scenes even missing connection with one another. There are no villain characters worthy of mention, which makes us unable to root for the hero.
The only two characters that leave us a mark on screen are Sai Pallavi and Uma Padmanabhan. I liked that there were no flashbacks on how Sai Pallavi and Suriya fell in love and married.
I am a fan of Director Selvaraghavan, even his commercial failures like Aayirathil Oruvan (2010) and Irandaam Ulagam (2013) are to be considered important works of Tamil cinema, yet NGK comes out nothing more than a cheap imitation of RJ Balaji’s LKG (2019), which had a similar storyline.
In summary, please avoid NGK!