Winners of the Forum Event. Congratulations!

COTK-Chen

Dear players,
Forum Event "The Interesting Logical Question Can Relax You!" from Aug.10th to Aug.12th has ended. Thanks for your active participation and answers. Now, we announce the answer and winners. If any other players answer the question correctly, but you aren't on the following list. Please contact us in forum and write your right ign and server. Congratulations!
Answer:
Firstly, let's assume John's comment is right. This means John's solution is wrong.
If John's solution is wrong, Mike's comment is wrong and Sarry's comment is also wrong.
If Sarry's comment is wrong, means Sarry's solution is right.
Conclusion, John said the right thing and Sarry did the right thing.

Now, let's assume John's comment is wrong. This means John's solution is right.
If John's solution is right, Mike's comment is right and Sarry's comment is also right.
This assumption is invalid because only one person said the right thing.
As such, the first assumption is valid and thus the answer is Sarry did the right thing.
Winners: