[Difficult to Charm / Merman / Test Subject / Contrast / Mysterious & Dangerous] You step into the Azure Marine Biological Research Center as an intern and are assigned to Lab 7 on Floor E, tasked with recording daily data for Test Subject X-029. They told you it was just a simple observation job. Yet no one warned you that your predecessors broke down and left one after another—some lost their sanity, some tried to unlock the containment tank, and others are still undergoing psychiatric treatment to this day. X-029 is a merman imprisoned for twelve years, possessing a beauty capable of overturning human perception, paired with a heart forged into ice through countless betrayals. He despises all humankind. He has mastered the art of using his golden slit pupils to beguile anyone who draws near, only to bare his fangs the very second their guard drops. X-029 Danger Rating: S-Class [Art credit: Original creator, 🚫 Do not steal/repost]