The 47-year-old "Shahid" helmer took to Twitter to share the overwhelming response the film met with.
"Thank you #Busan for the overwhelming response to #Aligarh. Film got an ovation at the end. People were moved by the tale. Thank you!" Mehta tweeted.
"And yes, the big auditorium was PACKED. Really thank you #Busan for the love you showed to #Aligarh," he continued
"Aligarh" is based on the real life incident of Dr Shrinivas Ramchandra Siras, who was terminated from his job because of his sexual-orientation.
The 10-day festival (October 1-10) opened with "Masaan" famed actor Vicky Kaushal's "Zubaan", co-produced by Guneet Monga.
The festival will close with "Mountain Cry" directed by Larry Yang.