Kim Jo Han and SISTAR's Hyolyn Transform in the Shrek Couple

The end of the year is full of specials, but KBS' Yoo Hee Yeol's Sketchbook took special to another level.

On December 21, Yoo Hee Yeol had a special episode, full of talented guests such as Kim Gun Mo, Park Jung Hyun, Shin Chi Rim, 10cm, K.Will, Sweet Sorrow, Brown Eyed Girls' Gain, Sung Si Kyung, and more.

Each artist put on a special stage, but it wasn't as shockingly hilarious as Kim Jo Han and SISTAR's Hyolyn's performance when the two vocalists came out in full costume as Shrek and Princess Fiona from the movieShrekand started singing Eric Benet's Spend My Life with You.

They performed without cracking up once and sang their hearts out in a serious manner, causing laughter from the audience.

Photo Credit: KBS