I Dominate Other Worlds by Spreading the Truth

Chen Fan travels to another world and is bound to the "causal mirror system" - everything he says will become the truth. So he started to make some flirty moves: "This sect leader actually likes to wear women's clothes" and "The secret treasure is under the latrine". Until one day, the system warned him: "Host, the rumor you spread that 'the world is virtual' is coming true..."