Hei Gou's eyes were full of grateful and happy emotions, but deep within a stubborn and decisive gleam could be found.
It was obvious that while he was grateful towards the worry and care his companions showed him, he was not willing to back down. The risk he was facing was, indeed, big, but to him, it was worth it.
Hei Gou was, naturally, not willing to die, but he did not fear death either. To him, death was inevitable, and it would catch him at some point sooner or later. Even if his lifespan turned out to be unending, he was painfully aware that there would always be someone stronger out there, and just like those he had killed throughout his life, he would, too, one day encounter an expert that he would be unable to beat.
Since death would one day claim him, then he did not worry too much about the when or how. To him, the most important part was to make sure that by the time he did die, he would be able to look back on his life and nod his head without feeling regret.