H1B - AC21 Rule clarification on H4 EAD

Most likely you will be eligible for H-4 work permit by then but depends on dates of actual filings and approvals.

How long time i have to stay in usa after my l1 visa danied

They are out of status now but likely would be excused to stay for the rest of the school year when applying for future visa. May depend on the...

My green card expired 2month ago, i didn't have change to renew however, i want to attend the funeral in korea?

File your I-90 online and print the receipt and take this with your expired PR card and your passport and you should be fine.

Can US citizen apply for sister's family who are already in US on a work permit visa to Greencard and get it process faster?

I agree with Hany. an EB-1C case with the employer as a multinational manager would be very fast.

As a Canadian citizen, after getting laid off on TN and going back to Canada, can I return to US to apply for jobs as a tourist?

that is an acceptable use of a tourist visa with the intent to return and apply for a TN if you are offered a position.

Specialist Physician (NIW - Advanced Degree Professional) approved and I-485 already filed

did you complete the 5 years in NIW already? As long as good faith offer after PR received then continuing I-485 while temporarily working in...

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CBP website indicates that I departed the United States

This has happened frequently especially if you had a return ticket for that date. You or your lawyer should go to the nearest CBP Deferred...

Change of Status from L2 dependent Visa to L1 work visa

yes this is possible provided you meet the eligibility requirements -- the rule is three years prior to entry in lawful status.

Should I be worried about a re-entry into the United States if I file for a diversion?

Probably not but no one can give you an opinion without seeing the actual documentts.

Is it allowed to work for two employers at a time on H1B.

Yes this is permitted to have as many H-1B employers as you can handle but you will need concurrent H-1B with each one. Part-time is also allowed.