Khaldor seems to be in a big role in Part 1 at least, where he is touring the LG-IM team house etc. Lots of interviews of different players and managers. Such as Parting, Nestea, Seed, Kang Dong-Hoon (Manager of LG-IM) and others.
Part 2 & 3
+ Show Spoiler +
If someone has more info about the whole documentary, who made it exactly and so on, feel free to let me know and i will edit the OP if necessary. After watching the first part, whole documentary seems very well done. Lots of insight and interviews.