Thrown Into a Game Horror System, Forced to Romance a Bull Demon

Three years ago, a bizarre rule descended upon the world, randomly pulling people into game instances. Those who cleared the instance could return to the real world and receive generous rewards, while those who failed would die instantly. When Su Qingqing suddenly opened her eyes, she found herself chosen and pulled into the "Legend of the Rules: The Flame Train" instance. Only by disembarking alive could she return to the real world. The bizarre boss of the Flame Train instance was the Ox Demon, who established five rules: Rule 1: Passengers must obey orders; Rule 2: No toilets at stops; Rule 3: Silence for three breaths; Rule 4: Seats cannot be changed; Rule 5: No unusual sounds can be detected! Any challenger must abide by these five rules, or they will be instantly eliminated. Just as Su Qingqing was about to break the rules, she awakened a system. The system required her to gain favor with the Ox Demon to acquire skills that could help her pass the instance. Thus, Su Qingqing embarked on her cheat-like journey of conquering the Ox Demon and obtaining skills…

Synopsis from DramaGo.