: The mystery of the metal ball serial killer concludes as Chi-yeol discovers Dong-hui’s true identity as Seong-hyeon. After a tense confrontation on a hospital rooftop, Dong-hui refuses Chi-yeol’s help and drops to his death, citing his desire to "protect" the tutor as his twisted motivation.
Episode 15 of Crash Course in Romance , titled "The Result of Chance and Inevitability," serves as a dramatic turning point that resolves the series' primary thriller subplot while introducing new family tensions. The episode shifts from the intense pursuit of the "ball bearing killer" to a more emotional focus on the consequences of parental pressure and the definition of true family. Crash Course in Romance (2023) Episode 15
: Following the exam leakage scandal, Sun-jae makes the brave choice to withdraw from school to take responsibility for his actions, eventually planning to take the GED. He also finally confesses his long-held feelings to Hae-yi. Romance & Relationships : The mystery of the metal ball serial