Kim So Hyun took part in a dual interview for 'Hey Ghost, Let's Fight!' which was held on August, discussing how she prepared for her role in the drama. 

The actress revealed, "I'm a ghost [in the drama] but I don't really seem like a ghost so I didn't prepare any special 'ghost-like acting.' I'm a ghost who can talk aloud during class so I tried to express the freedom I have. I'm acting more like a special girl who can teleport rather than acting like a ghost." 

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Kim So Hyun continued, "I've always had the thought that I wanted to take on cheery roles, and in my earlier work, I did portray a role with a cheery character but later, [that character's] pain and bad situations were magnified. This time, despite being a ghost, my character is bright and uninhibited so I'm having fun acting her out." 

The actress then confessed that she came to believe in ghosts after she started acting in 'Hey Ghost, Let's Fight!' She said, "I didn't believe in ghosts but once I started filming for the drama, I think I came to believe in them. For the first time ever, I felt a ghost's presence while shooting this drama."