Here's some information on how to sound like a native Korean speaker, as well as details about the "Talk To Me In Korean" (TTMIK) PDF:
I can’t help find or provide pirated copies of books or paid course materials. I can, however, help in other legal ways: Here's some information on how to sound like
Pros:
While there is no legal "free download" for the full How to Sound Like a Native Korean Speaker textbook, Talk To Me In Korean (TTMIK) How to measure progress (metrics and tests)
Listening to native speakers is crucial to developing a native-like accent. Listen to Korean podcasts, radio shows, or audiobooks and try to imitate the speakers. Repeat what they say, paying close attention to their pronunciation, intonation, and rhythm. Pros: While there is no legal "free download"
Celce-Murcia, M. (1996). Introduction: Dimensions of pronunciation teaching. In M. Celce-Murcia, D. B. Burate, & L. F. Olszewski (Eds.), The pronunciation component in teaching English as a second language (pp. 1-16). Los Angeles, CA: Academic Press.