It isn't a good hanjie, but that's a little harsh... Oct30, please test your puzzles to make sure they're solvable before you submit them. And keep making them :)
Think it wasn't intended, but it's pretty much logical for me with 2nd order logic (or w/e it's called) used 2-3 times. I did have multiple solutions for last 3 squares which can be assumed by looking at the image.
My Logical Hint: Figure out which placement of the 5 in C1 will allow the 4 in C2 to fit.
Then do the same for the 4 in R10 that allows the 1s in R9 to fit, repeat for R8 and R7.