Na-young is enraged at Su-ji for not keeping her promise to arrange a lesson with Ms. Son. U-ri is troubled by Su-ji’s abrupt change in demeanor ever since he mentioned seeing her cry at the hospital. Jang-soo is anxious as he frets over Mr. Gong disappearing. Meanwhile, the highly anticipated 50th-anniversary celebration at Haedeul Hospital unexpectedly leads to a reunion with Su-ji's former friend.