Kim Sejung was Jin-Soo's clubmate back in Hghschool. They were both part of the VR game club. Back at that time she was a rather extreme introvert. They meet again at the old club's alumni meeting and she ends up sleeping at his place due to her having drunk too much alcohol.

Solmi's Channel
Jinsoo, an engineer specializing in augmented reality, has always dreamed of using the technology in creative ways. So when Solmi, a camgirl, asks him to develop adult content for her live stream show, he’s presented with the opportunity of a lifetime. He finally has enough money to research and design at his will, whether it be holographic clothes that allow people to walk around naked in public, or gadgets that boost orgasmic pleasure. Tune in to Solmi’s channel for some hot, high-tech porn.