After being discharged, Mun's first project was supposed to be KBS' action drama "Poseidon" opposite Kim Ok-bin, set for broadcast in July 2011. However they dropped out when production was halted after the Bombardment of Yeonpyeong incident in November 2010. Instead, he appeared in another KBS drama, "Spy Myung-wol" with Han Ye-seul in July, playing a Korean wave star who is at the center of a kidnap plot by North Korean agents.