It wasn't that the security at the wedding wasn't strict enough; it was Feng Rao's identity.
Feng Rao was originally a member of the Netherworld Pavilion. When Nangong Jin punished her, he didn't dispose of the entire pavilion, so many brothers were unaware of this incident.
This made it easier for her to sneak in. It was normal for people from the Netherworld Pavilion to carry weapons, so it didn't arouse much suspicion.
Her former position as Nangong Jin's right-hand person provided her with the greatest convenience.
As for how she got close to the royal infants, it was indeed a lapse in security.
The arrival of the Queen caused a relaxation in the security around the infants, as the servants and nannies, who had never seen the Queen, wanted to take a look amidst the excitement.
This momentary negligence gave Feng Rao the opportunity to act.
Di Mingjue was very angry and immediately fired all these servants and nannies, even placing them on a blacklist for employment.
