I think the novel was an English original. It's set in a LitRPG world where people can get combat classes or non-combat classes. The old people were prepared to die to give combat class exp to their children/grandchildren. Some kind of traditional suicide as the MC said. I read up until the main character fighting in a dungeon with his grandfather when a teleporting dude tried to kill him. The teleporting dude almost won but then his grandfather ran himself through the dude's sword and grappled him. The MC then proceeded to kill the enemy and then reluctantly also finished off his grandfather.
Ahh that most definitely was it. Many thanks my friend. I totally forgot to put it on my reading list. Now it's on there for sure! Skimmed through it again and the story's still fun but there haven't been any updates. What a shame.