Worries of the proceedings of transit were solved by awesome crew
優點: Even though the communication in English was quite difficult with the majority of the flight attendants, one particular attendant was super nice and went to any length to take care of problems I and other non-Chinese speaking passengers experienced.
Arriving in Beijing, I was worried about the proceedings as mentioned in the negativ comment box, but an employee from Hainan Airlines went to pick up passengers transferring to Seoul and take care of the check in process.
缺點: Before boarding the flight, it was not possible to check in online to my connecting flight from Beijing to Seoul. I didn't receive the necessary information and even after I was told about it after calling an employee of Korean Air, I didn't work. The person I spoke with on telephon herself didn't understand, why the system didn't accept my attempt to check in online. That was quite bothersome since I could get a boarding ticket for my Korean Air flight beforehand. Normally I would have to leave the transit area, line up to check in, receive the ticket, go through all check-ups again and go to the gate of departure. My flight left just 2 hours after arriving in Beijing and at airports as big as Beijing, that could have been very close to not being able to make it in time.