The attempt to arrest President Yoon has failed, fortunately this did not turn into a huge brawl:

Investigators from the state anti-corruption agency and police officers leave the premises of impeached President Yoon Suk Yeol’s official residence in Seoul on Jan. 3, 2025, after failing to execute a warrant to detain Yoon over his failed bid to impose martial law in December. (Yonhap)
The state anti-corruption agency suspended its attempt to detain impeached President Yoon Suk Yeol over his failed martial law bid Friday following an hourslong standoff between investigators and presidential security staff.
The Corruption Investigation Office for High-ranking Officials (CIO) is expected to make another attempt to detain Yoon over the weekend, while the Presidential Security Service (PSS) threatened to take legal action against “unauthorized trespassing” on the presidential residence.
Here is Yoon’s lawyers’ view of this arrest warrant:
The official said three prosecutors were allowed to walk up to the front of the residence, but not inside, making it difficult to determine whether the president was at home.
The prosecutors did, however, meet with two lawyers for Yoon — Yun Gap-geun and Kim Hong-il — who the official said repeated their position that the president could not comply with a warrant issued “illegally” to an agency unauthorized to investigate insurrection charges.
I still have not read a clear explanation of if what Yoon did was unconstiutional or not. It was clearly stupid and not something I would have advised, but was it illegal? If anyone has any links that lays out clearly the ROK President’s ability to declare martial law please leave them in the comments section.
Besides Presidential security blocking the attempt by investigators to arrest Yoon he also drew a large crowd of demonstrators in support of him:
Rallies by Yoon’s supporters outside the presidential residence, however, have complicated the CIO’s effort, along with the potential for clashes with the PSS.
More than 1,000 pro-Yoon protesters gathered near the residence on Friday morning. Surrounded by some 2,700 police officers deployed to maintain order, they chanted: “Illegal warrant. Completely invalid” and “Arrest the CIO.”
When news broke about the CIO’s withdrawal, the protesters, whose number had grown to 11,000 according to a police estimate, erupted in cheers and shouted “We won” while waving the South Korean and U.S. flags and chanting the president’s name.
You can read more at the link.