Of all a sudden, Jin felt his sweat slowly wetting the back of his shirt. Participating in the National Dungeon Symposium? That would basically be an open invitation to have his secrets possibly exposed.
For not being a proper dungeon supplier.
At the moment, he could get away with it mainly because Jin was able to divert such questions to the quintessential excuse of 'trade secrets'. However, if he were to join the National Dungeon Symposium, authentic high grade dungeon suppliers would have genuine questions for him.
Even Ke Loong had his suspicions and assumed that Jin was using technology more advanced than the current prototypes. But Mr Know-it-All told him to trust Jin fully and work with him instead of doubting him.