Copying what I posted in the Which quirks of Raghav Rao should Raunak Reddy have? poll:
One thing that the first episode told us about Raunaq Reddy is that he must spend time shirtless in front of the mirror, similar to Raghav Rao playing table tennis. His chest tattoo is written so as to be read in a mirror: XXIIXX MURDERS AVI.
The first line could be in Roman numerals: 21/01/20 or 20/02/20 or 10/12/20. Probably the date some people were murdered. Whatever the date is, it is two to thirteen months before Mehandī Hai Racanevālī's on-screen timeline began.
The third line could be the word AVENGED in progress. Maybe Raunaq is a vigilante who fills in his tattoo as he bumps off each murderer.