Singer Gain performed "24 Hours" by Sunmi.

MBC "Show! Music Core" aired today was its 400th episode special. On this day, Gain and Sunmi switched their songs and performed one another's choreography.

Gain came out in a sexy outfit that was cut up in parts and came out barefooted. She caught much attention with her sexy performance.

Internet users who saw this commented, "I almost thought this was her song", "So sexy", and "The song fit her perfectly".

Photo Credit: MBC