If you caught episode 11 of 'Kill Me, Heal Me' this week, then you could not have missed out on the awesome and hilarious rap battle between actors Hwang Jung Eum and Ji Sung!

In the scene, an angry Ji Sung takes off his necktie and refuses to wear it while his doctor disguised as his secretary tries to force it back on him. He tells her he can't wear it, so to put it aside, while she tells him she can't put it aside, so wear it. The two go back and forth until they start rapping it out before the intervention of his actual secretary.

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This caused a lot of laughter and gained a ton of attention, so a rep revealed to TV Report on February 12 that this had all been ad-libbed by the actors themselves! The rep stated, "The rap battle becoming a hot topic was ad-libbed by the actors. It wasn't in the script, but Ji Sung and Hwang Jung Eum work so well together that it occurred naturally."

Meanwhile, the broadcast achieved a viewer rating of 10.9%, placing first in its time slot. Check out the hilarious moment above!