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The characters of small pain in my chest are stranger and soldier.

The stranger was the one who came upon the dying soldier. He was the one whom the soldier asked for water to drink.

The soldier, unknown to him, was dying because of a wound on his chest. All he knew was that an explosion occurred the night before and his comrades died while he stayed alive but felt a pain in his chest.

The soldier died after telling his story to the stranger and the stranger hugged the soldier after he died.