It looks like the KCTU trucker protest has been a failure for them:
The trucker strike is over 16 days after it started, a majority of union members voting to go back to work, and some just dispersing.
In votes held at 16 locations nationwide, 62 percent of the 3,574 that cast ballots agreed to end the strike.
The decisive climb down came a day after the government said it would order more truckers back to work, extending the legally binding orders to steel and petrochemical truckers. Cement truckers received back-to-work orders last week, and all but one complied or indicated the intent to do so. (…….)“We decided not to ask the opinion of our union members as asking the members to vote on whether to continue to strike is an attempt by leadership to avoid accountability and pass that responsibility to the members,” a Busan union official said. “The general strike didn’t end up with the results that we expected was because of the Yoon Suk-yeol government breaking its promise, oppression and anti-labor policies.”
Joong Ang Ilbo
Truckers went into strike on Nov. 24. Cargo Truckers Solidarity, the trucker union under the militant Korea Confederation of Trade Unions (KCTU), failed to rally public support amid concerns over the weakening economy and several reports of violence directed at non-union truck drivers.
The strikers were also swayed by the heavy penalties of the back-to-work order. They could face up to three years in jail and up to 30 million won in fines for not complying. Threats to end certain government subsidies were also made.
You can read more at the link, but I think the threats the KCTU was making against trucker drivers trying to go to work really soured the public on the protests.