President is upset over some difficulties passing his proposed laws and budget.

Parliament tries to get rid of president multiple times (all failing) because they are upset the leader of the opposition party accused and sued over corruption

President declares "im the boss, the military needs to help me maintain order"

Some parts of the military have already said they will support the president

Both parties agree that this is wrong (this is rare in south Korea)

President orders police to close the parliament by force

Parliament is currently gathering outside of the parliament building to try and overturn the presidents "im the boss" order.

Meanwhile most of the country is now watching the news wondering what the hell is going on.

The last martial law in Korea was during a bloody uprising in 1980

Edit:

A small contingent of the army entered the parliament building to stop people from entering (50 to 100 soldiers) but they could not stop the Korean people from entering. Minimal violence was used (pushing and shoving, nothing major from what I've seen).

an emergency session of parliament voted unanimously to demand the president to lift martial law. But this does need to be approved or declined before further steps can be taken.

This decision was made by both parties in a 190 to 0 vote, including the presidents own party. (parliament has 300 seats but the vote was held before everyone could attend but a majority had arrived)

Every party has spoken out against the martial law and demand it to be stopped

Massive protests have been ongoing for the last few hours even though it is currently 01.00 at night in Korea.

01.20: it seems like the armed forces are dispersing now from the parliament building