What string?

I don't remember much details as this series took some time to update. But if I recalled correctly.. MC's ring can detect if a person is under the spell of the princess ( the string thingy is the manifestation of the spell I think). The spell was place on ml's tongue. So ml took the ring from MC then scraped off the flesh of his tongue a bit by bit while observing the ring (string) once the string had disappeared. So Ml is now free from the spell threat of the princess.

Thank u so much