There are no demonstrations planned for next weekend, since it is the Lunar New Year Holidays, which is like Christmas for Koreans, Japanese, Chinese, Taiwanese and muc of Southeast Asia, a time for families to gather.
If Lee Jae-young is convicted of bribery, then Samsung would have to pay penalties to many countries that have laws against foreign corruption. Maybe it would be better to lock them up on other charges, overlook bribery. Bribery is so hard to prove, when the main suspect didn't receive any bribes directly, but through companies, or foundations and the assets are in other people's names.
