
Hyun Woo explains to Ji Sang and Ri Ta that the new drug given to ward 21A patients is a combination of immune serum and vaccine. This serum boosts immunity as expected but kills the vaccine to some degree. “Can be a live vaccine but still.” Ji Sang said.
“VBT-01 minimized subculture,” Hyun Woo continued. Ri Ta asked the two of them to explain “ scientific languages” that they did not understand. Ji Sang said that his condition was not really a vaccine, but a similar state of infection. That requires balance. If that balance is lost, then the infected patient quickly becomes a vampire. It can infect others. Ji Sang insists that the main problem here is about balance. New drugs made by the new drug development team are very unstable.
Jae Wook asked Ga Yun's facial expression, asking about the last subculture vaccine. He replied that there was nothing wrong with using a better method. “Is something wrong?” his tank. Ga Yun claimed not to question his methods, but only wanted to know the extent of his new drug development. Jae Wook asked why Ga Yun asked so many questions now. Ga Yun apologized and asked Jae Wook not to be Na Jung as the subject of the research. Jae Wook made sure he wouldn't.
Ga Yun was about to leave, and Jae Wook called him back. He declared that he did not want Ga Yun to be a weakness for him. If that happens, it will be fatal.
Somewhere, J and his partner gather an army of black-clothed vampires. J notices his troops when his partner is contacted by Jae Wook who orders the troops to be given the serum, so his true mode is not visible. His colleague J.
Ri Ta and Ji Sang go together. Because it was the first time for them, Ri Ta looks happy and scoffs at Ji Sang who is hard-earned self-defense but the results are serious. Ji Sang smiled, having remembered Ri Ta's style used to be like an LA girl. They then see a pair of lovers wooing each other in a park.
After they left, Ri Ta wanted Ji Sang to seduce as well like that. Ji Sang refused, but Ri Ta was already standing in the flower garden and said, “Try to find me!” Either insensitive or how, Ji Sang directly pointed at the place where Ri Ta was standing. Ri Ta snorted, judging Ji Sang as not being engrossed. He shuddered to himself knowing Ji Sang's overly serious mindset.
Ri Ta chased after Ji Sang and complained that his left hand finger was curly due to shudder earlier. Ji Sang said he would straighten the finger for Ri Ta. She clasped Ri Ta's hand and walked comfortably. It made Ri Ta an amused smile all by herself.
At the hospital, In Ho felt his body ache. He checked his temperature and the thermometer showed 32.2 degrees. He injects himself with Jae Wook's blood serum. It was unexpected that a junior doctor saw him from the sidelines of the window.