Everything else.
Poor management, toxic work culture, racism and sexism run rampant.
Turnover rate is extremely high, and the company is running out of operators/engineers to hire due to nobody wanting to work here (understandably so).
If you aren't able to speak/understand Korean, and refuse to work unpaid overtime, expect to be handed little to no responsibility, and treated like trash.
Qcells will also pay you a lot less if you are a non-US citizen, since you don't have a choice but to keep working here. (The longevity bonus for working a DECADE here is $500.)