So I noticed that not many people sign up for his class and instead opt for Park. Bottom line is, take Park if you want to learn the material, and take Song if you want easy exams. Song's exams were straight from the book and homework (just with different numbers). He gets the harder problems from the chapter reviews. The curve is set pretty low, which I don't understand. His accent is very heavy, but you get used to it. Just sit in the front.