Merciless 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

Virtual Reality Survival Game "Merciless"

Somewhere, cameras are rolling,
and those who put their faces on a broadcast for money are forced to either kill or be killed. Standing at a crossroads of choice.

"It feels uncomfortably real, like I've actually killed someone..."

A brutal world where everyone must kill each other.
A person who had been living an ordinary life...