I am a vampire

Prologue

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“Oh my”
"sorry"
“Take care and have a good trip.”
What are those four things?

'..?what'

Lecture time
‘Oh, those are the four from back then.’
“Hello, I saw you earlier in front of me..”
“It was fate that we met like this, and we’re close.”
“Oh, yes.”
‘It’s still stiff’

After class, Yeo-ju walks with Tae-hyun.
“Excuse me, what is your name?”
"This is Kang Tae-hyun."
“Your name is pretty.”
“You may not be wondering, but my name is Lee Yeo-ju.”
“Your name is pretty too.”
‘Is that the person from before..?’

The heroine stumbles because of Taehyun's usual carefree personality and his change from earlier.
"ouch"
“Are you okay?!”
“Ah..yes;”

“Oh! Blood..”
"are you okay.."
The embarrassed heroine runs away
“I’m sorry.”

..
"Found it"
“Pure-blooded human”