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Sojin said, "I did a bunch of different types of part-time jobs when I was a student. One of these jobs included working in a sock factory. When the socks would pass by on the conveyor belt, my job was to stick brand name stickers on the merchandise. The combination of the repetitive motion and quick pace caused me to faint one day. Some of the older ladies at the factory gave me yogurt drinks so I would regain consciousness. I stopped working there after that incident." 

The rest of the cast on the show seemed both pleasantly surprised and shocked by Sojin's high work ethic. It's admirable that she was willing to do whatever it took to make ends meet.