Now That I'm Done, What Should I Do If I Dress Like an Eighty-Year-Old Man?

My name is Zhu Lin. I traveled through time and became an eighty-year-old man with only one month left to live. Fortunately, I activated the system of killing enemies and cultivating immortals. Killing enemies can gain experience, improve your cultivation, and extend your life. In order to upgrade, I joined the army and became a soldier of Zhu Yuanzhang. I thought this body was too old, so I made a clone based on the appearance of my previous life and let the clone enjoy life for me. I am invincible in this world, but I have no experience in killing frightened enemies. Therefore, I can only use fairy magic secretly on the battlefield. I repeatedly performed extraordinary feats and soon became the first contributor to the founding of the Ming Dynasty. On the day Zhu Yuanzhang ascended the throne, I finally merged with the memory of my predecessor, and I was shocked. I hid the truth until one day—— "Dare you kill your mother? Little bastard, I will beat you to death!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.