A Multicenter, Double-blind, Parallel, Non-inferiority, Phase III Study

Inclusion Criteria: * Given written informed consent * Healthy Korean adults (age: between over 19) * Women of childbearing age with negative Urine hCG in screening visit Exclusion Criteria: * Subjects unable to communicate (illiterate or who cannot understand the questionnaire and/or the study subject diary) * Subjects participating in another clinical study or has participated in a clinical study in the last 30 days (the participation should be based on the final dose of the investigational drug) * Subjects with impaired immune functions that include immune deficiency diseases * Subjects with a history of Guillain-Barre syndrome * Hemophilia patients at risk of serious bleeding with intramuscular injection or who had taken an anticoagulant * Subjects with symptoms of active infection or who had higher than 38.0℃ fever before the investigational product administration * Subjects to be planned to have a surgery in the study duration or subject who the investigator decides exception because of a clinical significant chronic or malignant disease or medical history to interrupt the study procedure * Subjects with erythema and/or a tattoo in the injection site of the scheduled investigational product (the deltoid muscle) that is hard to identify the topical toxicity * Subjects with a history of allergic reaction to eggs or chicken, the vaccine components, and/or Formaldehyed, Gentamicin and Sodium Deoxychloate * Subjects who had been administered the influenza vaccine 6 months before the scheduled vaccination of the investigational product * Subjects who had been vaccinated with another vaccine within 30 days before the investigational product administration or had a scheduled vaccination during the clinical study period * Subjects who had received an immunosuppressant, immunity-modifying drug, cytotoxic chemotherapy that can affect his or her immune system, or radiation therapy within 3 months before the investigational product administration * Subjects receiving systemic steroids (more than 20 mg/day of prednisolone administered everyday over 14 days or more than 700 mg of a cumulative dose during the same period of time) within 3 months before the administration (Day 1) of the investigational product (topical ointments, eye drops, inhalants or intranasally/intramuscularly administered drugs, or topically applied drugs such as ligaments; unless administered every other day over 14 days) * Subjects who had received immunoglobulin or a blood-derived product within 3 months before being vaccinated with the investigational product or is scheduled to receive those products during the clinical study period * Pregnant women, nursing mothers, or women of childbearing age who do not perform adequate contraception (using a condom, diaphragm, IUD, or hormonal contraception 21 days before vaccination with the investigational product or whose male partner had undergone a vasectomy) Subjects who have other clinically significant medical or psychiatric examination findings deemed by the investigator to make them ineligible for participation in this clinical study