Sword in the Lake

The master said that if the second son wanted to leave the village, he needed to keep the master's sword at home, and the second son agreed. At the age of seventeen, he went down the mountain for two years to explore the world. Unfortunately, he was defeated and returned to the mountain to recuperate... At the age of eighteen, his second grade skills improved, he went down the mountain again, and was defeated again... At the age of nineteen, I went back to the mountain to rest for a year... At the age of twenty, he went down the mountain twice and met the person he was destined to be, and the second person. I am now in my twenties and thirties and have been back in the mountains for ten years. I felt a little emotional when I counted down the enemies I met along the way. When you pick up the master's sword, who should you kill first? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.