I choose a beautiful girl roommate over a domestic gigolo

Su Younian senses something's off about the people around him. His yandere fiancée, who once locked him in a dark room, now acts out, acting like a naive naiveté. His older sister, who married into his family with his stepmother, loves to tease him. His younger sister, whom he found on a deserted island, loves to trip him up. His personal maid, while seemingly obedient, secretly peeks at him. After much deliberation and under pressure, Su Younian decides to run away from home to make his position clear...