I Lead the World

When I woke up, I became the only mortal disciple under Yue Lao. After my master retired, he actually left me the marriage system that connects all the worlds. From then on, the sword fairy and the witch, the mecha master and the elf queen, the abyss lord and the goddess of light... No matter how many worlds are separated, as long as the marriage value is enough, there is no red thread that I can't hold! But, why am I still single?