GMC 187

Moon Gyeon-woo toyed with Yeon-rok's chest.

“When a name partner's condition is severely critical, there's a method of giving a blood transfusion as an emergency measure. However, none of the three of us have a blood type that can be transfused into you. You're type O, and we aren't. So, we had no choice.”

While type O can donate blood to anyone, they cannot receive blood from anyone unless it's the same blood type. Dizziness washed over him, and Yeon-rok squeezed his eyes shut before opening them again.