This is VERY HIGHLY OVERRATED. 
The most part of the movie is foul-playing, most of those scenes seem to have been copied from the 1999/old Vijay’s movie: Minsaara Kannan [IMDB: https://www.imdb.com/title/tt7562630/?ref_=nv_sr_srsg_2], (Warning: This again might be a copy of some other movie as well]. 
“Morse code” has been used in a much better way in 2017 Ajith’s film: Vivegam [IMDB:https://www.imdb.com/title/tt6878378/?ref_=nv_sr_srsg_0] [Letterboxd: https://letterboxd.com/film/vivegam/]
I just don’t understand what makes this movie so special that it has been appraised so highly. It is not even 10% of the Tamil movies at this level/standard.
People who’re praising this movie must start watching Tamil movies instead of Korean, there are so many gems that have gone unnoticed.
There is really nothing special in this movie that stands out. 
Cannot digest that an average movie like this has got so much limelight. Btw: Where does this kinda BS trend start off?