G×G!P Hong Hae-in met a woman named Y/N, unaware that Y/N was a renowned neurosurgeon, someone who could potentially save her from a brain tumor. Their encounter took place in Germany, where Hae-in had traveled for surgery. As Hae-in strolled through the vibrant streets of Germany with her husband, she had a fateful meeting with Y/N, who happened to be the sister of her secretary.