Responses
spoiler
sorry this doesnt fully answer ur q but
basically sayoung refuses to tell him until J finds the answer for them to have an equal relationship
here's the novel to continue off of tho! https://mentoltrans.wordpress.com/episode-120-short/

Alright, I'm not a novel reader, and I'm just asking out of pure curiosity... What will J do after knowing all the suffering Lee Sayoung went through??? Will he immediately take revenge or directly eliminate everyone connected to the people who made Lee Sayoung an experimental subject?