Tang San had never seen his father's face so radiant, with various complex emotions constantly appearing on Tang Hao's face. After a long time, he slowly said one sentence, "Remember, in your future, you must use the hammer in your left hand to protect the grass in your right hand. Forever."

  Tang San nodded inexplicably. Tang Hao stood up and left without looking back.

  While preparing lunch, Tang San thought about the world of martial souls he had come into contact with today. Dual martial souls seemed to be very rare in this world; otherwise, his father wouldn't have been so shocked. It seemed that his own hammer martial soul had touched him deeply.

  For him, what's more important is the relationship between Wu Soul and Xuan Tian Gong. If that soul ring is the key to his Xuan Tian Gong being unable to break through, then no matter what, he must find a way to get a soul ring to test it out.

  At noon, Tang Hao was very silent, and even the amount of rice he ate seemed to be much less than usual. His eyes fell on Tang San from time to time, as if hesitating about something.

  After lunch, Tang San habitually prepared to clean up the bowls and chopsticks, but was stopped by Tang Hao.

  "Let's put it away for now. Xiao San, I'm asking you, do you want to become a Soul Master?"

  Tang San was taken aback for a moment, looking at Tang Hao. He didn't want to deceive his father, and after hesitating for a moment, he nodded slightly.

  Tang Hao let out a sigh, his face looking even more aged. "You will ultimately still choose to walk this path." He only said this one sentence before returning to his own room.

  Tang San discovered that when Tang Hao sighed, there was disappointment in his emotions, but more of it was a relieved expression. He understood that in the heart of this father of his, it seemed like many things were hidden.

  After putting away the bowl and chopsticks, Tang San returned to his room to continue his work. The rhythmic clanging of the hammer and iron block echoed out. Although he didn't know when he could forge this piece of raw iron into a fist-sized ingot as required by Tang Hao, this method of forging had considerable benefits for improving his use of the Mysterious Heaven Technique, and its effect on physical training wasn't bad either. Tang San had already begun trying to use as little internal energy from the Mysterious Heaven Technique as possible when swinging the hammer, so that he could maintain a longer duration with each consecutive strike.

  When the hammering had gone on for over three hundred times, and he felt that the piece of pig iron had been purified of some impurities, the door curtain was lifted, and Tang Hao walked in. He didn't seem to have been forging farm tools this afternoon, at least Tang San hadn't heard the familiar sound of hammering.

  "Dad." Tang San looked at his father, the iron hammer in his hand stopping involuntarily.

  Tang Hao made a gesture for him to continue, then walked aside and stood still, without saying a word, just looking at him.

  Tang San continued to wield his hammer, and by now, the clothes on his body had been drenched with sweat. With his current internal energy, it was still not enough to adapt to the temperature, let alone that this was an extremely physically demanding task.

  Dang, dang, dang, dang, dang...... The sound of hammering kept ringing out. Tang San's small body and the iron hammer in his hand were not proportional, but every time he swung it, it was as fierce as a tiger.

  Tang Hao thought to himself, "With his innate divine power and the full soul force of the Xiantian, it's no wonder he can wield that iron hammer at such a young age." Perhaps Old Jack was right; he shouldn't let his own decadence affect this child's development. From now on, he would let him forge his own path.

  Watching Tang San sweat profusely, Tang Hao finally made up his mind.

  "Wait a minute." Tang Hao said.

  Tang San put down the iron hammer in his hand, slightly panting, and quietly activated the Xuan Tian cultivation method to recover his physical strength.

  Tang Hao walked to Tang San's front, took the iron hammer from his hand, and looked at the iron block burning red on the stove. "Even if you hit it like this for a year, it won't become fist-sized."

  Tang San looked up at his tall father, "Then what should I do?"

  Tang Hao said coldly: "Tell me, when you swing the forging hammer to strike it, which part of your body starts to exert force first?"

  Tang San thought for a moment and said: "It should be the waist. From the waist, drive the back, then drive the arm to swing the casting hammer?"

  Tang Hao neither confirmed nor denied Tang San's statement and continued to ask, "Apart from the brain, what is the most important part of a person's body?"

  "It's the heart." Tang San replied without hesitation. The heart and brain are both instantly fatal places, but the brain has a skull to protect it, while the heart only has skin and muscle. As a disciple of the Tang Sect, he was very familiar with the human body structure. Using hidden weapons to pierce the enemy's heart was the most effective and simplest way to kill.

  Tang Hao paused for a moment before saying: "Then tell me, how many hearts does a person have?"

  "What?" Tang San looked at him in surprise, somewhat bewildered. Do people have several hearts or what?

  "Answer me." Tang Hao's cold gaze made Tang San feel stifled, his physique and aura exerting a crushing pressure that left him gasping for air.

  "One."

  Tang Hao shook his head and said, "No, you're wrong. Remember, a person's heart has three, not one."

  "Three?" Tang San stared at Tang Hao in a daze, not understanding what he meant.

  Tang Hao flipped over the hammer in his hand and tapped Tang San's two calves with the handle, "Here. The muscles on a person's two calves are the second and third hearts. If someone wants to exert their full strength, it must be the result of all three hearts working together. So, when exerting force, it doesn't start from the waist. The three hearts are the starting point."

  "When your heart beats rapidly in your chest, start with the two small legs, transmit the power to the thighs, through the waist and back, to the arms, and finally release it. This is a full-force strike. The heart initiates the force, the waist is the axis."