There are many people learning Korean now, so the employment pressure is increasing. However, Korean enterprises in Yantai are also blooming everywhere, and employment is not a problem in a short time. Considering the instability of Sino-Japanese relations and the wave of boycotting Japanese goods that may break out at any time, I suggest you choose Korean.
Upstairs upstairs said that "Korean words are hard to remember" really beg to differ. As we all know, the difficulty in learning Korean lies in pronunciation, and the difficulty in learning Japanese lies in grammar. 70% of the words in Korean are Chinese characters, so Korean words are very easy to remember.
The Korean language used in Suowen is a Korean teacher. I suggest you consider it carefully, because Korean and Korean are different. To learn Korean, you must learn authentic Korean (not Korean). I suggest you choose some professional foreign language training schools, such as Hana, Xinghe, Sosa, Sante, or some Korean training classes, such as Hua Teng of Yantai University, or Ocean Korean teaching in ludong university. These are basically taught by Koreans or Korean teachers, and the quality is still guaranteed. (Of course, it's not that the quality of Suowen is not guaranteed, but it's just that learning Korean is not good.). Another option is that, if possible, I suggest you take the national college entrance examination and get an undergraduate degree in Korean, which is offered in many schools. The better ones are Beijing Foreign Studies University and Dalian Foreign Studies University. If Yantai is local, Yantai University and ludong university can choose.
Of course, this is just a suggestion. I hope it can help you a little.