Episode #1.4 - S1-E4
Continuity mistake: Right after Yeo-rin realises Kang-bae works at the supermarket, the angry customer whose arm she is holding onto asks "Who the hell are you?" At this moment, Yeo-rin has all four fingers, positioned side by side, wrapped around the customer's wrist. The customer attempts to hit Kang-bae and there is suddenly a small gap between two of her fingers. (00:01:40)