a burning hill

I'm trying to find a manhwa (yaoi) where there is this assassin type of mc in which he has "brother" that he "betrayed" and is always guilty cuz of it. Now he is trying to snatch up a diamond from the ml whose like a fashionista type person. There's also a girl whose a goddaughter of Yakuza and the mc has a hacker typer friend who was close to his brother too. The last chapter I read was when the mc discovered that his "brother" is alive and there was moving vehicle and they confronted in the back of it. My memory is hazy but I enjoyed the art so much and would love to catch up on it! It's very much annoying how all of my ongoing reads are gone so any help would be appreciated