“Did you perhaps meet that scoundrel?”
“That weak parasite here, did you meet him again?”

*

So-eun's first love, Joo-han, is the executive director of 'Seohan,' one of South Korea's leading corporations.
Such a Joo-han harbors a secret he cannot tell.
That is, he suffers from Dissociative Identity Disorder, where his daytime and nighttime personalities are different.

So-eun, who became the personal physician of the 'Seohan family' at the request of Tae-geon, the chairman of 'Seohan' and like a brother to Joo-han's deceased father,
One day, she encounters Joo-han's other personality.

“Call me Joo-han.”
“Just hold my hand. You don't have to do anything else, okay?”

Unlike the daytime Joo-han, who emits sharp gazes,
There is the nighttime Joo-han, who, with affectionate eyes, burrows into So-eun's arms like a large dog.

So-eun, despite him being one person,
Finds herself constantly wavering between the daytime Joo-han and the nighttime Joo-han…