If you have not reached Episode 5 yet, prepare yourself. If you have, you know exactly why this episode lives rent-free in fans’ heads.

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If the first four episodes were about Jaeyoung cornering Sangwoo and invading his personal space, Episode 5 is where Sangwoo finally stops running. The episode title often alludes to the idea of a "semantic error"—a mistake in logic that doesn't stop the program from running but makes it behave unexpectedly. Here, Sangwoo’s rigid logic begins to fail him, and he starts behaving "erratically" (falling in love).