S Line

S01E04 Meishin Hotel

As Ji-wook delves deeper into the mystery surrounding the Seon-ah case, he comes across the S-line theory from Hyun-heup, but remains skeptical. Meanwhile, Bang Ju-goo, a hopeful actor residing in a goshiwon, discovers S-line glasses in Mi-seong's apartment, which gives him a sense of freedom. However, his excitement quickly turns to jealousy when he encounters a woman linked to his former crush, the music teacher, reigniting feelings he thought he had overcome.