An ordinary day of an extraordinary sibling begins in the cramped bathroom, bickering about toothpaste.

So Ra finds Sung Tae sleeping in his boxers at her place and feels appalled. Ba Da tries to help Ye Rin.

Ba Da gives all his money to Do Hoon wishing for So Ra's happiness, but soon, he realizes the shocking truth.

Pushed by Do Hoon, Ba Da falls to the ground, bleeding. Fortunately, Ye Rin takes him to the hospital.

So Ra decides to become Sung Tae's manager for Ba Da, who is ill. She learns that Sung Tae is illiterate.

So Ra takes Sung Tae to an agency to get him a commercial gig. Sung Tae gets attracted to So Ra.