On 7 January 1946, she was decommissioned and transferred to Commander Naval Forces Far East (COMNAVFE), Shipping Control Authority for Japan (SCAJAP), redesignated Q004.

Around 2 am on June 29, not knowing that the Munsan was left at Mukho Port, she was bombarded by USS Juneau (CL-119), which she mistook for a ship of the Korean People's Army Navy.

The battalion, which barely landed, attracted the attention of the 2nd Corps of the Korean People's Army for a week, and in the battle with them, Captain Hwang Jae-jung and crew of the Munsan were killed.

The survivors were covered by the 7th Fleet bombardment task force, which had USS Helena as their flagship, on September 19 and withdrew aboard the ROK Navy's LST Jochiwon.

On March 6, 1997, the forgotten operation of the Korean War was revealed to the public when the members of the 1st Marine Division Special Reconnaissance Unit, who were searching the shore in front of Jangsari, discovered Munsan in the tidal flat under the sea.