Losing 2-3 kg to show that exhaustion is really amazing!

Park Bo-young said, "The director said he wanted me to get thinner as the story progressed, so I think I lost the most weight. He wanted me to lose weight in my face, so I went on a diet, but I just couldn't muster any energy. I had absolutely no vitality. I think it did help in the later scenes because Hee-ju was going through a really tough time. I heard that because she was physically exhausted, she even secretly ate snacks behind the director's back to muster up strength! That's truly amazing!"