Responses
I think this is it yup.
But... its seems that sunbae revealed the videos of his previous relationship. And I didn't understand why
No, Sunbae was caught looking at the videos so his previous relationship didn't work out (not surprising)
This time the read head caught them having sex in the bathroom and recorded their voices.
So let me get this straight, Sunbae recorded the videos of his previous relationship for private use. However Mr. Cheater created the voice recording, and this was blamed on Sunbae, with Sun Hwa taking the brunt of the humiliation?