Harland Defense is an old man.
He holds the world’s only Risk Rarity Level 8 rating,and even that doesn't fully express the overwhelming power of this one-of-a-kind hitman. He takes on missions from governments and the most influential people in the world,receiving weapons from a girl known as “Mourning Dress” and executing each job precisely and perfectly.
“I want to create a world without crime.”
The greatest hitman had only one small weakness.
That weakness was the peaceful, troubled girls with a story behind them who lived in the apartment building where Harland worked as the apartment Manager.
A thrilling yet heartfelt story unfolds in the hitman’s life, filled with both secret missions and charming everyday moments with girls who have stories of their own.

Official Website
Original Webtoon

Official Translations:
English