I Conquer the World by Singing

[The super cute male protagonist of the nurturing system has a prototype in reality. Those who love to raise babies will not lose money if they invest in it (｢･ω･)｢Hey] Zhou Xingchen thought he had traveled through time, into a world where war was constantly raging. The doctor I saw when I opened my eyes was wearing a traditional costume and a white coat. The eldest sister I met in the field held a fairy wand and directed the beasts to plow the fields. The most outrageous thing is, why can the person who is teaching physics in the school take off without using wires? Newton's coffin boards can't even hold it together! What the hell kind of place? Totally unscientific! Later he realized that it was not the world that was strange, only the villagers in this village. Forget it's weird, but could you please stop calling me "Lord" after me? I really can't do anything except singing and cooking! Summary: This is the story of a poor, helpless but capable soul singer, who pretends to be a pig and eats the tiger while conquering the world with his singing. PS: The title of the literary version of this book is "Only Songs Determine the Mountains and Rivers"