Brain Works - Season 1 Episode 14
The Best Revenge

Ha Ru decides to put his knowledge to use to prove Yi Na’s innocence, and he does it so fluently. This brings Ha Ru and Myung Se’s family a bit closer, at least that’s what Myung Se believes. However, Ha Ru’s sole purpose of making Myung Se go through what he had to go through remains. At the same time, he stumbles upon crucial evidence that Myung Se has done something illegal.