"From now on, it will be the world of Ahn Yo Na!"

On the episode of MBC "Kill Me Heal Me" (script Jin Soo Wan, director Kim Jin Man, Kim Dae Jin) broadcast on Feb. 18th at 10PM, Cha Do Hyun (played by Ji Sung) changed to the personality of Ahn Yo Na (played by Ji Sung), a high school girl. Afterwards, he tried to plant a surprise kiss on Oh Ri On (played by Park Suh Joon).

Do Hyun was meeting with Ri On at a café at this point. While Ri On was trying to get coffee, Do Hyun suffered from a very severe headache. After expressing his pain, he changed to his new personality, Ahn Yo Na, a high school girl.

Yo Na said, "You just call me when you're going through tough times and sXXX. This is so bothersome." With this, she cursed and poured out profanities out loud. She then touched her hair by herself saying, "From now on, it's going to be Ahn Yo Na's world!" Then, as soon as she saw Leon bringing coffee, she shed tears of happiness. She called Leon, "Oppa!"

Leon was startled but Yo Na ran over to hug him at once