The love triangle intensifies as Sin-yu and Kwon Jae-gyeong vie for Hong-jo's attention. An unexpected person begins to make Hong-jo uncomfortable.

Hong-jo decides to put up boundaries with Sin-yu. But after she encounters an unsettling situation, he comes to her aid.

While Hong-jo and Sin-yu both experience illnesses, a sinister plot forms in the dark. Later, they share a tender moment of connection, present and past.