I want the name of a martial arts movie.

I saw it a long time ago, but I didn't know its name since I started reading it halfway. It was about a young man who had the same terminal illness as his mother and left home to wander the world. She was saved by a woman dressed as a man, so the two of them left together. That woman was a famous heroine in the martial arts world. It seemed like they were snatching some treasure, and in the end, they fell in love. There seemed to be an old monk who kept pointing out the way for the boy. In the end, he was the BOSS and kept causing trouble for the male lead. There was a black spider on his arm. After the duel, the old monk died. In the end, the male protagonist pointed out that the heroine was an imposter, so she revealed her true identity. It turned out that she was a secret envoy from a certain country who had come to China to seize the treasure, and the boy had been poisoned. Originally, he would have died without a doubt, so before the woman handed the treasure to the person who was in contact with her, she also took the poison and wanted to die for love. At the end, the male protagonist appeared because the poison happened to cure his incurable disease. In the end, the treasure was snatched back, and the male protagonist left with the female protagonist's corpse. I don't remember the rest. It's a very old movie. Anyone who has seen it, please help me. Thank you!