Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 674 - 673: The Yin Yang Union Sect

Vincent Strider was a gun for hire who made a living by killing whoever it was his clients wanted dead. But during one mission, he died in a fierce gunfight. However, death was not the end for him. Vincent found himself reincarnated in another world, facing a floating interface that flickered before his eyes.[Synchronizing Host!][Military System initializing.]Vincent found out that in this system he received, he can summon soldiers, tanks, aircrafts, and even warships! This is going to be exhilarating.

The constant mission is getting redemption.

Shuttle though various worlds to become a variety of scum men, do a little whitewashing and become a good man in the eyes of everyone.

Redeem those who are miserable, and let them live a happy life.

- Description from Novelupdates

Ronan was just another overworked office drone until a sudden death transported him to a vast, unfamiliar fantasy world—alone, invincible, and armed with absurdly powerful abilities from a game he once played. But reality isn't as simple as a game, and after days of wandering the unending Nim Forest without finding civilization, his optimism begins to fade.Just as isolation threatens to wear him down, he encounters Frieren, a quiet elf girl hiding in the bushes. Their meeting marks the first step on a path neither of them fully understands, in a world that seems empty, yet full of mystery.

Yan Ting: Life is no fun. What is the difference between life and death?

Li Zhao: Life is very happy.

The world in Yan Ting’s heart was very grey until he met Li Zhao. He thought this must be the liveliest person in the world. Otherwise, how could Li Zhao be so lively in his heart every day?

Very happy x Unhappy.

Warm text with entertainment circle elements.

- Description from Novelupdates