On the episode of the MBC drama "Father, I'll Take Care of You", Kang Hee-sook (Shin Dong-mi) found her real son, Han Ji-hoon (Sin Gi-joon).
Kang Hee-sook did everything in her power to make Han Ji-hoon top of his school until she learned that Han Ji-hoon and her nephew Han Chang-soo (Son Bo-seung) had switched. However, she got back her liveliness when started supporting Han Chang-soo and eventually got him to win first place in the singing concour.
Kang Hee-sook noticed something was off when Hwang Mi-ok (Nah Moon-hee) drunk talked and ran a DNA test on Han Ji-hoon. She was outraged to find out Han Ji-hoon was her real son. In front of the grown-ups of the family, she said, "Ji-hoon is immature and my brother is crazy. But how can you all do this?"