The ending song of the 12th episode is the episode "rightnow" sung by Lee Jong Suk for TV series, and there is no official audio version yet.

in our memory, at the other end of the dream, you called me, and your voice became clearer and clearer, guiding me inmytrack. I pushed you away and turned a blind eye, and I pushed you away again in my memory. Because of your rich fragrance in my mind, I was suffering from repeated pain.