The Final Ingredient for the Cure

Claiming that he needs the final ingredient for the Stirge phobia cure, Mong from Kong in Kerning City asked me to go get a Vitamin Gummy from his grandfather, Mr. Goldstein in Lith Harbor. To think that Mr. Goldstein was Mong from Kong's grandfather... Only characters at Level 17 or higher can complete this quest.

Mr. Goldstein in Lith Harbor handed over the Vitamin Gummy with a suspicious look. Will this really be, okay?

It seems like Mong from Kong in Kerning City still needs something else.