Madman of the Song Dynasty

He was proficient in music and used simplified musical notation to create countless music all over the world. He knows chess, flags, and backgammon. He understands medicine and knows how to use surgery to treat patients. He knew the art of war, improved cannon gunpowder, and could use steam balls. ........... Liu Yiran joined an Internet company. During a team-building event, due to a yacht accident, he traveled through time and space to the Qingli period of the Northern Song Dynasty. He met Yang Yanzhao's fellow sect Yang Qingzhi by chance. After the two became brothers of the opposite sex, they learned the Yang Family Boxing and secret weapons from the descendants of the Tang Sect; He taught five-line musical notation and famous songs, and the two developed a secret love for each other, and eventually got married; he helped the Song Dynasty army create powerful crossbows and infantry armor, which severely damaged the Xixia Yipintang and Wudumen. After various hardships, he finally changed the historical process of "poverty and weakness" in the Northern Song Dynasty...