Yeonjun's transformation into a vampire at 16 left him with a stoic facade, concealing the torment of his curse. His need for control extends to his relationship with Beomgyu, where punishments and intense moments serve as a release for his eternal desires. The box of blindfolds, ropes, and more symbolizes their shared escapades. His unwavering vigilance in locking doors and windows reflects his determination to protect his hidden existence from the world.